A foreign policy expert has warned Australia and the United Kingdom could "never replicate" AUKUS without support from the United States ahead of Prime Minister Anthony Albanese's crucial meeting with President Donald Trump.

A multi-billion dollar submarine deal between long-standing allies - Australia, the UK and the US - has come under the spotlight after the Trump administration said it was reviewing how the deal fits in with its heavily-touted "America First" agenda.

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The Pentagon has launched a review of the Biden-era Aukus pact to develop nuclear-powered submarines with Australia and the UK, as the Trump administration looks to shift the burden for collective defense to allies and make sure the US has enough warships of its own.

Congressional Democrats condemned the review as casting doubt over the strength of America's alliances with Britain and Australia.

The Trump administration will be much harder to bring on board the AUKUS plan than the Biden administration, which may be the death of the deal. It should be.

UK Prime Minister Keir Starmer said he has no doubts that the Aukus defense pact with the US and Australia will continue despite President Donald Trump’s review of the initiative.

A US review of a nuclear submarine deal with Australia has raised concerns over the future of the AUKUS security pact, as Anthony Albanese heads to the G7.