US President Donald Trump said Australia would get coveted nuclear-powered attack submarines and signed a deal on rare earth minerals with Prime Minister Anthony Albanese at the White House on Monday.

The promise to Australia came after the Trump administration said earlier this year it was reviewing a deal for the subs signed under previous president Joe Biden.

"The submarines that we're starting to build for Australia are really moving along," Trump told reporters as he sat alongside Albanese in the cabinet room of the White House.

"We've worked on this long and hard, and we're starting that process right now. And it's really moving along very rapidly, very well."

Australia's government had been hoping for Trump's blessing of the 2021 agreement for at least three of the silent, Virginia-class submarines within 15 years.

The AUKUS submarine deal between Australia, the United Kingdom and the United States could cost Australia up to US$235 billion over the next 30 years, according to Canberra.

But the Trump administration said in June it had put AUKUS under review to ensure it aligned with his "America First agenda."

The two leaders also signed a deal on critical minerals and rare earths, which are vital for the technology that runs the global economy.

Albanese has touted Australia's abundant critical minerals as a way to loosen China's grip over global supplies.

Australia sits on deposits of lithium, cobalt and manganese as well as rare earth metals used in technologies from semiconductors to defence hardware, electric cars and wind turbines.

Albanese announced plans in April for a strategic reserve of critical minerals to provide to "key partners" such as the United States.

The reserve is designed to help relax China's hold on global critical minerals production, which it has been accused of leveraging to pressure trade partners.

Trump this month threatened 100-percent tariffs on China in response to its latest rare earth export curbs.

But Trump insisted on Monday that he now predicted a "fair" trade deal with China at talks in South Korea with President Xi Jinping.

The Australian premier meanwhile managed to ride out an awkward confrontation between Trump and Australia's ambassador to Washington – former prime minister Kevin Rudd.

Rudd deleted a series of critical social media posts about Trump following the Republican's election victory last year.

"I don't like you either. I don't. And I probably never will," Trump said to Rudd when a reporter pointed out that the ex-PM was in the room and asked the US president whether he minded the comments. (AFP)