The Prime Minister has significantly stepped up his language over the Solomon Islands security deal with Beijing – saying he will not allow a Chinese military base on Australia's doorstep.

It comes as the Government accuses Labor of a "racist attack" over an ad targeting Hong Kong born Liberal M-P Gladys Liu.

Meanwhile, Morrison has vowed there will be no new taxes if the Coalition is re-elected.

Mr Morrison was set to guarantee the Coalition government won't introduce or raise any new taxes and will deliver $100 billion worth of tax relief over the next four years.

Much of that will go to high-income earners.

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The Prime Minister will use this as an attempt to wedge Labor on the economy but the Opposition has ruled out tax increases except on multinationals.

Mr Morrison attended a late-night Easter mass at a Greek Orthodox parish in Sydney on Saturday night.

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Opposition Leader Anthony Albanese remains stuck at home in isolation due to COVID-19.

Earlier, his deputy leader Richard Marles struggled to answer questions about the impact of Labor's climate change policy, before he asked the shadow treasurer to step in.