The criticism comes ahead of Wednesday's final vote on his attorney general nomination.

He added that while Trump won the election, it doesn't mean "the Senate has to bow and step back a few steps for every nominee."

ADVERTISEMENT Democrats lined up on the Senate floor Tuesday as they gear for up for a late-night talkathon to protest their Alabama Republican colleague. They argue that Sessions, the president's first Senate supporter, wouldn't be able to say "no" if the Trump administration tried to push the boundaries of the law.

The battle over Sessions's nomination comes as the Trump administration is locked in an early legal battle over the executive order targeting nationals from seven Muslim-majority countries. Sessions, as attorney general, will be responsible for defending the action.

Trump has in recent days lashed out against Judge James Robart, a George W. Bush-appointed federal judge who slapped a nationwide halt on his executive order.

"He took to Twitter. Twitter, like a teenage kid, to attack the judge's legitimacy, labeling him a 'so-called judge,'" Leahy said. "President Trump then attempted to blame this judge...for any future terrorist attack on this country. The president's words are beyond outrageous."