Former US president Donald Trump has been accused of sharing sensitive defense information with Australian billionaire Anthony Pratt, according to a Friday report by ABC News.

The report alleges that months after leaving the White House, Trump revealed potentially sensitive information about US nuclear submarines to Pratt, a member of Trump's exclusive Mar-a-Lago Club.

Pratt then shared those secrets with a number of other people, including "more than a dozen foreign officials, several of his own employees, and a handful of journalists," said the report.

The FBI has already interviewed Pratt twice in the last year.

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According to the report, Trump excitedly shared information relating to the number of nuclear warheads on an American submarine and how close those submarines could approach a Russian submarine undetected.

Trump shared this information after Pratt told Trump that he believed that Australia should be buying submarines from the United States.

Pratt relayed Trump's remarks to at least 45 other people, including six journalists, 11 of his company's employees, 10 Australian officials, and three former Australian prime ministers, the ABC report said.