The US has launched a review of its multi-billion dollar submarine deal with the UK and Australia, saying the security pact must fit its "America First" agenda.
Under the trilateral pact, widely seen as a response to the growing power of China, Australia is to get its first nuclear-powered subs from the US, before the allies create a new fleet by sharing cutting-edge tech.
Both Australia and the UK - which did its own review last year - have sought to play down news of the US probe, saying it is natural for a new administration to reassess.
The move comes as Australia faces pressure from the White House to lift its military spending, from 2% to 3.5% of GDP, a push so far resisted by Canberra.
The agreement - worth £176bn ($239bn; A$368bn) - was signed in 2021, when all three countries involved had different leaders.
