Republican presidential nominee Donald Trump Donald John TrumpOmar fires back at Trump over rally remarks: 'This is my country' Pelosi: Trump hurrying to fill SCOTUS seat so he can repeal ObamaCare Trump mocks Biden appearance, mask use ahead of first debate MORE on Thursday claimed that Hillary Clinton Hillary Diane Rodham ClintonButtigieg stands in as Pence for Harris's debate practice Senate GOP sees early Supreme Court vote as political booster shot Poll: 51 percent of voters want to abolish the electoral college MORE had received questions ahead of a debate.

"Why didn't Hillary Clinton announce that she was inappropriately given the debate questions - she secretly used them!" Trump tweeted Thursday, adding: "Crooked Hillary."

Why didn't Hillary Clinton announce that she was inappropriately given the debate questions - she secretly used them! Crooked Hillary. — Donald J. Trump (@realDonaldTrump) October 20, 2016

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The GOP nominee did not clarify if he was referring to Wednesday night's final presidential debate of 2016 or a debate that took place in the past.

Trump has previously attacked his Democratic rival after a recent WikiLeaks email dump appeared to show that Democratic National Committee (DNC) interim Chairwoman Donna Brazile had given the Clinton campaign a question for a CNN town hall event in advance.

In an email dated March 12, 2016, Brazile — a CNN political analyst and the then-DNC vice chairwoman — wrote to Clinton communications director Jennifer Palmieri about a question on the candidate’s stance on the death penalty with the subject header: "From time to time I get the questions in advance."

In a statement , CNN said, "To be perfectly clear: We have never, ever given a town hall question to anyone beforehand."