Supreme Court Justice Clarence Thomas will administer the official constitutional oath to Judge Amy Coney Barrett on Monday night if she is confirmed by the Senate, a senior White House official told Fox News. 

Thomas has long been considered one of the more conservative justices on the Court, along with Barrett's mentor, the late Justice Antonin Scalia. The would-be celebration of her confirmation won't be a large affair, President Trump said, noting that it will be "just a very nice event."

Trump made those comments to reporters on Monday at Lehigh Valley International Airport in Pennsylvania, Politico reported. The president has been holding rallies in the swing state as part of a final push to win support for next week's election.

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Barrett's confirmation, which is expected to take place on Monday evening, will mark his third successful appointment to the high court within his first term. The highly contentious process has provoked backlash from Democrats, who claim Republicans hypocritically jammed her nomination through after rejecting Judge Merrick Garland's in 2016. 

In a video retweeted by Senate Minority Leader Chuck Schumer, D-N.Y., he accused Republicans of committing "one of the greatest acts of hypocrisy that has ever occurred in the Senate." Read more at FOX News