The Pentagon has launched a sweeping review of the AUKUS submarine pact with Australia and the U.K., raising concerns that the U.S. could scale back or withdraw from the agreement as Trump’s administration pushes to prioritize U.S. naval readiness and domestic production.

Deal Faces “America First” Scrutiny

Signed in 2021 under President Biden, AUKUS commits the U.S. to sell up to five nuclear-powered Virginia-class submarines to Australia, followed by joint development of a next-gen SSN-AUKUS submarine with the U.K. But the Pentagon now says it must determine whether the pact aligns with President Trump’s “America First” agenda.

“This means ensuring the highest readiness of our servicemembers,” the Pentagon stated, emphasizing a push for allies to shoulder more responsibility.

Production Delays and Cost Blowouts

Critics, including Defense Undersecretary Elbridge Colby, have questioned whether the U.S. can afford to export submarines while its own attack fleet faces gaps. The Virginia-class program is already $17 billion over budget and two years behind schedule.

“We’d be crazy to have fewer SSNs in the right place and time,” Colby wrote on social media, suggesting U.S. defense needs should come before foreign transfers.

Australia and U.K. Warn Against Backtracking

Australia’s Defence Ministry confirmed that both Canberra and London were notified of the review. A spokesperson said they respect the review process but reaffirmed their commitment, noting a A$500 million downpayment was already made.

“Clear and consistent support for AUKUS has been shown,” Australia said, referencing U.K.’s recent reaffirmation of the pact.

Strategic Fallout If Deal Is Scrapped

If the U.S. withdraws or significantly alters the agreement, it would deal a severe blow to Australia's defense posture and industrial planning. The AUKUS framework has been central to Australia’s long-term Indo-Pacific deterrence strategy amid China's rising maritime assertiveness.