Australia is confident of proceeding with plans to buy nuclear-powered submarines from the US as the Pentagon nears finalising its review of the AUKUS military pact.

The US will not make any changes to the trilateral military agreement with Australia and the UK, a report from Nikkei Asia says.

A senior US defence official has been investigating the deal to sell nuclear submarines to Australia, to ensure it aligns with President Donald Trump's "America first" agenda.

The review by Under Secretary of War for Policy Elbridge Colby sparked speculation Mr Trump could be preparing to walk away from the deal.

Nikkei Asia reported the review would finish before Prime Minister Anthony Albanese's much anticipated visit to the White House on October 20, and no decision has been made to change the

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