President Trump on Monday called former acting Attorney General Sally Yates to answer questions about how classified information was leaked to newspapers.

"Ask Sally Yates, under oath, if she knows how classified information got into the newspapers soon after she explained it to W.H. Council," the president tweeted Monday.

Ask Sally Yates, under oath, if she knows how classified information got into the newspapers soon after she explained it to W.H. Council. — Donald J. Trump (@realDonaldTrump) May 8, 2017

Anticipation is high ahead of testimony Monday before a Senate Judiciary subcommittee from Yates.

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Yates, who was fired by Trump after her refusal to back his controversial immigration executive order, is expected to give her account of the warnings she gave to the White House regarding former national security adviser Michael Flynn's contacts with the Russian ambassador to the U.S.

Yates reportedly told the White House that Flynn might have misled White House officials, including Vice President Pence, about the content of his communications with Ambassador Sergey Kislyak.

Trump fired Flynn in February after reports he misled Vice President Pence and other White House officials about his conversations with Kislyak.

White House press secretary Sean Spicer told reporters in February after the president fired Flynn that Yates only "wanted to give a heads up to us on some comments that may have seemed in conflict with what [Flynn] had sent the vice president."