The comment came amid a string of questions from Graham pressing Wray, a former senior Justice Department official in the Bush administration, during his confirmation hearing before the Senate Judiciary Committee.

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Trump has repeatedly decried the ongoing probe into possible ties between his campaign associates and Russia as a "witch hunt." He used the term in a tweet early Wednesday defending Donald Trump Jr. following scrutiny over a meeting Trump Jr. had with a Russian lawyer last year.

"My son Donald did a good job last night. He was open, transparent and innocent. This is the greatest Witch Hunt in political history. Sad!" Trump tweeted following Donald Trump Jr.'s appearance on Fox News the previous night.

My son Donald did a good job last night. He was open, transparent and innocent. This is the greatest Witch Hunt in political history. Sad! — Donald J. Trump (@realDonaldTrump) July 12, 2017