Donald Trump's historic second impeachment trial has opened with graphic video showing the former president whipping up a rally crowd to march to the Capitol and "fight like hell" against his re-election defeat, followed by images of the deadly attack on Congress that came soon after.

In an early test of the former president's defence, Mr Trump's team lost a crucial bid to halt the trial on constitutional grounds. Senators confirmed, 56-44, their jurisdiction over the trial, the first of a president no longer in office.

While six Republican senators joined the Democrats in proceeding, the tally showed how far prosecutors have to go to win conviction, which requires a two-thirds threshold of 67 senators.

READ MORE: The latest on Trump's impeachment

The vote was on whether a former president could be tried after leaving office.

House Democrats prosecuting the case told senators they were presenting "cold, hard facts" against Mr Trump, who is charged with inciting the mob siege of the Capitol to overturn the election he lost to Democrat Joe Biden.

Senators sitting as jurors, many who themselves fled for safety that day, watched the jarring video of Trump supporters battling past police to storm the halls, Trump flags waving.

"That's a high crime and misdemeanour," declared Rep. Jamie Raskin, in opening remarks.

"If that's not an impeachable offence, then there's no such thing."

READ MORE: Democrat tearfully recalls Capitol riots

Mr Trump is the first president to face impeachment charges after leaving office and the first to be twice impeached.

The Capitol siege stunned the world as hundreds of rioters ransacked the building to try to stop the certification of Mr Biden's victory, a domestic attack on the nation's seat of government unlike any in its history. Five people died.

Acquittal is likely, but the trial will test the nation's attitude toward Mr Trump's brand of presidential power, the Democrats' resolve in pursuing him, and the loyalty of Mr Trump's Republican allies defending him.

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Mr Trump's lawyers are insisting that he is not guilty of the sole charge of "incitement of insurrection," his fiery words just a figure of speech as he encouraged a rally crowd to "fight like hell" for his presidency.

But prosecutors say he "has no good defence" and they promise new evidence.

Security remained extremely tight at the Capitol today, a changed place after the attack, fenced off with razor wire with armed National Guard troops on patrol.

The nine House managers walked across the shuttered building to prosecute the case before the Senate.

White House press secretary Jen Psaki said Mr Biden would not be watching the trial of his predecessor.

"Joe Biden is the president, he's not a pundit, he's not going to opine on back and forth arguments," she said.

With senators gathered as the court of impeachment, sworn to deliver "impartial justice," the trial started with debate and a vote over whether it's constitutionally permissible to prosecute Mr Trump after he is no longer in the White House.

Mr Trump's defence team has focused on that question, which could resonate with Republicans eager to acquit Mr Trump without being seen as condoning his behaviour.

Lead lawyer Bruce Castor said that no member of the former president's defence team would do anything but condemn the violence of the "repugnant" attack, and "in the strongest possible way denounce the rioters."

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Yet Mr Trump's attorney appealed to the senators as "patriots first," and encouraged them to be "cool headed" as they assess the arguments.

At one pivotal point, Mr Raskin told the personal story of bringing his family to the Capitol the day of the riot, to witness the certification of the Electoral College vote, only to have his daughter and son-in-law hiding in an office, fearing for their lives.

"Senators, this cannot be our future," Mr Raskin said through tears.

"This cannot be the future of America."

Trump attorney David Schoen turned the trial toward starkly partisan tones, the defence showing its own video of Democrats calling for the former president's impeachment.

Mr Schoen said Democrats are fuelled by a "base hatred" of the former president and "seeking to eliminate Donald Trump from the American political scene."

It appears unlikely that the House prosecutors will call witnesses, in part because the senators were witnesses themselves. At his Mar-a-Lago club in Florida, Mr Trump has declined a request to testify.

Presidential impeachment trials have been conducted only three times before, leading to acquittals for Andrew Johnson, Bill Clinton and then Trump last year.

Timothy Naftali, a clinical associate professor at New York University and an expert on impeachment, said in an interview, "This trial is one way of having that difficult national conversation about the difference between dissent and insurrection."

The first test was on the constitutionality of the trial, signaling attitudes in the Senate.

Six Republicans joined with Democrats pursue the trial, just one more than on a similar vote last week. Bill Cassidy of Louisiana added to the ranks of Susan Collins of Maine, Lisa Murkowski of Alaska, Mitt Romney of Utah, Ben Sasse of Nebraska and Pat Toomey of Pennsylvania.

READ MORE: The reasons for and against impeaching Donald Trump

The House prosecutors argued there is no "January exception" for a president on his way out the door. Rep. Joe Neguse referred to the corruption case of William Belknap, a war secretary in the Grant administration, who was impeached, tried and ultimately acquitted by the Senate after leaving office.

Mr Trump's case is hardly a run of the mill corruption charge, he said, but incitement of insurrection.

If Congress stands by, "it would invite future presidents to use their power without any fear of accountability."

In filings, lawyers for the former president lobbed a wide-ranging attack against the House case, suggesting Mr Trump was simply exercising his First Amendment rights and dismissing the trial as "political theatre" on the same Senate floor invaded by the mob.

Because of the COVID-19 crisis, senators were allowed to spread out, including in the "marble room" just off the Senate floor, where proceedings are shown on TV, or even in the public galleries above the chamber.

Most were at their desks on the opening day, however.

Presiding was not the chief justice of the United States, as in previous presidential impeachment trials, but the chamber's senior-most member of the majority party, Senator Patrick Leahy of Vermont.

Under an agreement between Senate Majority Leader Chuck Schumer and Republican leader Mitch McConnell, the substantive opening arguments will begin at noon Wednesday, with up to 16 hours per side for presentations. The trial is expected to continue into the weekend.

Mr Trump's second impeachment trial is expected to diverge from the lengthy, complicated affair of a year ago.

In that case, Mr Trump was charged with having privately pressured Ukraine to dig up dirt on Mr Biden, then a Democratic rival for the presidency.

This time, Mr Trump's "stop the steal" rally rhetoric and the storming of the Capitol played out for the world to see.

The Democratic-led House impeached the president swiftly, one week after the attack. Five people died, including a woman shot by police inside the building and a police officer who died the next day of his injuries.

Trump's first impeachment

Mr Trump's second impeachment trial is expected to diverge from the lengthy, complicated affair of a year ago.

In that case, Mr Trump was charged with having privately pressured Ukraine to dig up dirt on Biden, then a Democratic rival for the presidency.

This time, Mr Trump's "stop the steal" rally rhetoric and the storming of the Capitol played out for the world to see. The trial could be over in half the time.

The Democratic-led House impeached the president swiftly, one week after the most violent attack on Congress in more than 200 years.

Five people died, including a woman shot by police inside the building and a police officer who died the next day of his injuries.

House prosecutors are expected to rely on videos from the siege, along with Mr Trump's incendiary rhetoric refusing to concede the election, to make their case.

His new defence team has said it plans to counter with its own cache of videos of Democratic politicians making fiery speeches.

READ MORE: The reasons for and against impeaching Donald Trump

Initially repulsed by the graphic images of the attack, a number of Republican senators have cooled their criticism as the intervening weeks have provided some distance.

Senators were sworn in as jurors late last month, shortly after Mr Biden was inaugurated, but the trial was delayed as Democrats focused on confirming the new president's initial Cabinet picks and Republicans sought to stall.

At the time, Senator Rand Paul of Kentucky forced a vote to set aside the trial as unconstitutional because Mr Trump is no longer in office.

The 45 Republican votes in favour of Sen. Paul's measure suggest the near impossibility of reaching a conviction in a Senate where Democrats hold 50 seats but a two-thirds vote, or 67 senators, would be needed to convict Mr Trump.

Only five Republicans joined with Democrats to reject Paul's motion: Mitt Romney of Utah, Ben Sasse of Nebraska, Susan Collins of Maine, Lisa Murkowski of Alaska and Pat Toomey of Pennsylvania.

Protests in Myanmar against the military coup that removed Aung San Suu Kyi's government from power have grown in recent days despite official efforts to make organising them difficult or even illegal.

Here's a look at who is organising the protests and the obstacles they face:

READ MORE: Why did the military stage a coup in Myanmar?

Is protesting allowed?

It was a grey area for many days after the February 1 coup, which also included the declaration of a state of emergency.

But with the protests growing and spreading in recent days, the military on Monday issued decrees that effectively ban peaceful public protests in the country's two biggest cities.

Rallies and gatherings of more than five people, along with motorised processions, are outlawed and an 8pm to 4am curfew has been imposed for areas of Yangon and Mandalay, where thousands of people have been demonstrating since Saturday.

The restrictions have raised concerns about the potential for a violent crackdown.

Who is leading the protests?

For the most part the protests have grown organically.

"This movement is leaderless, people are getting on the streets in their own way and at their own will," Thinzar Shunlei Yi, a prominent activist, said.

Activist groups, professional work groups, unions and individuals across Myanmar have all come out in opposition to the coup, as has Suu Kyi's National League for Democracy party.

READ MORE: Ousted Myanmar leader charged over 'illegally imported walkie-talkies'

Shortly after the return to direct military rule , which Myanmar experienced for five decades until 2012, a Facebook page titled "Civil Disobedience Movement" started issuing calls for peaceful protests.

The page now has more than 230,000 followers and hashtags associated with it are widely used by Myanmar Twitter users.

Health care workers also started a protest campaign, wearing red ribbons, holding signs and urging other medical staff to not work at state-operated health facilities.

Street protests over the weekend featured the heavy presence of unions, student groups and other groups representing professions as diverse as park rangers and book printers.

Yangon residents have voiced dissent by banging pots and pans together across the city at night.

READ MORE: 'Deep concern' after Australian detained in Myanmar

What are the obstacles?

One of the biggest challenges for protesters has been the military's attempts at blocking communications.

Authorities first went after Facebook, which has more than 22 million users in Myanmar, or 40 per cent of the population, but people simply moved to other platforms like Twitter.

Making the rounds have been copies of safety protocol information sheets, some of them originally from Hong Kong, with instructions on how to encrypt communications and how to stay safe during protests.

Over the weekend the military temporarily cut internet access and some phone services.

Protestors were quick to adapt, with some even using phones registered in neighbouring Thailand.

"Even when the internet was completely cut off on Saturday for 24 hours, people were able to communicate within Myanmar by phone and SMS," Clare Hammond, a senior campaigner the rights group Global Witness, said.

For some who don't have phone service or internet access during blackouts, word of mouth and simply historical precedent has brought them to protest sites, many of which are the same as in previous uprisings against military rule.

Will the protests continue?

So far protesters seem undeterred, even with the new restrictions on demonstrations.

Nevertheless, some are concerned that the military is laying the groundwork for a violent crackdown such as those that ended protest movements in 2007 and 1988.

Linda Lakhdhir, a legal advisor at Human Right Watch, said the military could try to use the violation of the military's decrees as well as other laws already in place as justification for a crackdown.

"They may maybe a terrible, abusive, draconian laws, but the military will justify (use of them) as them following the law," she said.

Authorities fired water cannons and rubber bullets at some protests on Tuesday, ratcheting up tensions.

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Basketball legend Kobe Bryant's helicopter pilot pushed the limits of bad weather flying rules, and ultimately abandoned his training as he became disoriented in the clouds and crashed into a Southern California hillside last year, investigators said.

The National Transportation Safety Board investigators described the crash as preventable, the pilot as experienced, and his employer as a generally safe charter operation.

LIVE UPDATES: Trump's second impeachment trial starts today

They spoke at a meeting of the NTSB on Tuesday to settle on an official cause of the January 26, 2020, crash that killed Mr Bryant, his daughter, the pilot, and six others.

"Even good pilots can end up in bad situations," NTSB Chairman Robert Sumwalt said.

The meeting, still underway, will lay out possible long-lasting safety recommendations as a result of the crash, including more strident calls for increased safety training for helicopter pilots on how to avoid inadvertently flying into clouds.

The responsibility then falls to regulators at the Federal Aviation Administration, as well as helicopter charter companies and pilots, to act on the recommendations.

"We use the term crash rather than accident," NTSB Vice Chairman Bruce Landsberg said.

"An accident (is) just something that's unforeseen, unpredictable, if you will. Unfortunately this wasn't."

In the meeting, investigators said Island Express pilot Ara Zobayan may have felt pressured to perform for a high-profile client and continued flying into deteriorating weather conditions.

Mr Zobayan developed a "very close" friendship with Mr Bryant, investigator Dujuan Sevillian said, a type of relationship that "can lead to self induced pressure" to fly in risky conditions.

NTSB board member Thomas Chapman pushed back on officially concluding that pressure played a role in the crash, although he acknowledged pilots may contend with a "tendency to want to please" the influential person who charters their services.

They said he climbed into what witnesses described as a "wall of cloud," possibly became disoriented, and unconsciously turned into a cloud-obscured hillside he knew was there.

Pilots call that type of confusion spacial disorientation.

"It's not like … the pilot was flying along, didn't know where the hills are and blundered into the side of a hill," Mr Sumwalt said.

Island Express declined to comment to CNN on Tuesday.

Investigators said the helicopter was equipped to fly into clouds with the pilot operating solely in reference to the instruments – known as Instrument Flight Rules or IFR – but charter company Island Express' agreement with the FAA allowed only flights where the pilot could maintain visual contact with the ground, known as Visual Flight Rules or VFR.

"It would seem to be that these flights should have been operated under IFR," Mr Sumwalt said.

All 9 people on board perished

The helicopter crashed into hilly terrain in foggy conditions in Calabasas.

The passengers were heading from Orange County to the Mamba Sports Academy in Thousand Oaks for a youth basketball game in which Kobe Bryant was to coach and Gianna and two others aboard were to play.

In addition to Mr Bryant, 41, and Gianna, 13, the crash claimed the lives of her teammates Payton Chester, 13, and Alyssa Altobelli, 14; Payton's mother, Sarah Chester, 45; Alyssa's parents Keri Altobelli, 46, and John Altobelli, 56; assistant coach Christina Mauser, 38; and pilot Zobayan, 50.

READ MORE: Not just coronavirus: The things you forgot also happened in 2020

All nine aboard died of blunt force trauma, and the manner of death was accidental, according to a coroner's office.

Mr Bryant, a 41-year-old 18-time All Star who won five NBA championships with the Los Angeles Lakers, had made the trip to Thousand Oaks several times as a coach for the academy.

Pilot appeared to become disoriented in fog, previous documents show

Weather and visibility were a concern ahead of the flight, and Mr Zobayan discussed the plan to go ahead in a group text before the trip, NTSB documents released last year show.

Visibility was so low that morning that the Los Angeles Police Department had decided to ground its helicopters.

During the trip, the the pilot appeared to become disoriented in fog, the documents released last year by the NTSB show.

During the flight, Mr Zobayan told a controller in a final communication that he was going to climb to 4,000 feet to get over the clouds, the NTSB said last year.

Radar showed that around 9:45am, the craft climbed to about 700m above sea level and turned left, before descending at a rapid rate. it dropped off radar at about 400mt, near the crash site, the NTSB had said.

The first 911 call for the flight came in at 9:47am, Los Angeles County Sheriff Alex Villanueva has said.

The helicopter crashed into a hillside in Calabasas, and parts were found scattered across an area that stretched up to 180m, the NTSB said days after the incident.

READ MORE: Vanessa Bryant sues LA sheriff over helicopter crash photos

In a February 2020 update from the NTSB on the crash investigation, the board said there was no evidence of engine failure.

Later that month, it issued a preliminary report underscoring the overcast weather in the area that day.

Mr Bryant's widow, Vanessa, sued the Los Angeles County Sheriff's Department and Sheriff Villanueva following the crash over eight deputies taking photos of the scene and the deceased victims.

A leak from the department led to TMZ breaking the news, and fans flocked to the site.

California Governor Gavin Newsom signed an invasion-of-privacy bill in September which would make it illegal for first responders to share photos of a deceased person at a crime scene "for any purpose other than an official law enforcement purpose."

Under the new "Kobe Bryant Act," which went into effect this year, a first responder who is found guilty of the misdemeanor crime may be fined up to $1294 (US$1000) per violation.

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