US Defense Secretary Pete Hegseth hosted Defence Minister Richard Marles in Washington on Saturday in his first meeting with a foreign counterpart since being appointed on January 29.
The pair primarily discussed the trilateral AUKUS alliance including the nuclear-powered submarines deal that amounts to Australia's largest capital purchase in history.
Mr Hegseth offered the first indication of Mr Trump's support for the AUKUS deal in the absence of any comment from the returning president and fears new negotiations of the massive agreement could be ordered.
"The president is very aware, supportive of AUKUS," Mr Hegseth told reporters during his meeting with Mr Marles.
"(He) recognises the importance of the defence industrial base."
Ahead of the meeting, Australia announced it had made the first of six $US500 million ($A797 million) payments to boost the capacity of the troubled US submarine industry.
Australia is to buy between three and five off-the-shelf Virginia-class boats in the early 2030s as it prepares a domestic industry.
But US ship builders have long been failing to even produce the two-submarines-a-year the US government has been procuring itself, let alone Australia's order.
Mr Hegseth said he "sure hopes" his country could fulfil the deal as Mr Marles described the $US3 billion injection as a "a very unique and significant step" in the alliance.
In a later press conference, Mr Marles would not say if the US had indicated it would ask for more cash.
"This is the agreement that we have," he said.
"We are really happy with the conversations that we've had with the Trump Administration in relation to this.
"The optimal pathway - which is now underpinned in a trilateral treaty between our three countries (including the UK), which I signed in Washington back in August of last year - is an agreement that is going to endure over decades."
Australia's military budget is expected to rise to 2.3 per cent of GDP by 2034, putting it in line with current spending by the UK and ahead of France and China.
The AUKUS deal, which will enhance Australia's maritime and modern warfare capabilities, has been controversial since the day it was struck in 2021.
Midnight Oil frontman and former Labor minister Peter Garrett, in comments published on Saturday, said AUKUS had taken Australia's subservient relationship with the US to "a new dangerous, illogical and expensive extreme".
"This is the worst deal that we've ever seen done by a sovereign Australian government," he told the Guardian.
Even China hawk the Australian Strategic Policy Institute has raised concern about the complexity of the subs deal and the "unknowable" costs of the modern warfare arm.
The Albanese government is meanwhile continuing to ward off any Trump-imposed tariffs on the nation's exports as it highlights the trade surplus the US has with Australia.
Mr Trump overnight said he planned to announce reciprocal tariffs on many countries within days, ratcheting up his bid to reshape global trade.
"We will continue to press the Australian case around the question of trade," Mr Marles said.
"We are an island trading nation where trade forms an increasing share of our national prosperity."
Australia, which tore up its $90 billion diesel-powered submarine deal with France to sign on to AUKUS, will buy several off-the-shelf submarines, costing about US$4 billion each, before making its own.
The first Australian-made boats are due to be operational in the 2040s.
with Reuters
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