Late night comedian Stephen Colbert on Wednesday mocked Jeff SessionsJefferson (Jeff) Beauregard SessionsNadler sends Whitaker questions on possible contacts with Trump over Mueller probe Graham angers Dems by digging into Clinton, Obama controversies Martin, Bobby and the will to change MORE after he was forced out as attorney general.

"This morning Trump fired his attorney general, Jeff Sessions, seen here on his happiest day in the job," Colbert said on his late-night show, cutting to a picture of Sessions looking despondent.

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" 'My God,'" Colbert said, mockingly imitating Sessions. "'My God what have I become?'"

After months of criticism and insults from the president, Sessions resigned Wednesday.

“I came to work at the Department of Justice every day determined to do my duty and serve my country,” Sessions wrote in his resignation letter.

“I have done so to the best of my ability, working to support the fundamental legal processes that are the foundation of justice.”

Trump often slammed Sessions for recusing himself from special counsel Robert MuellerRobert Swan MuellerSasse: US should applaud choice of Mueller to lead Russia probe MORE's investigation into alleged collusion between the 2016 Trump campaign and Russia.

Sessions was a major policy adviser to Trump's campaign and said he recused himself for the potential conflict of interest.

"You can't blame Sessions for recusing himself," Colbert said Wednesday. "It's the only thing that's good that he's ever done!"

The late-night comedian and frequent critic of the administration also took aim at Sessions's temporary replacement, Matthew Whitaker.

"Who on earth would be willing to go down in history as the man who stepped in to fire Robert Mueller," Colbert said. "Enter new acting Attorney General, and caucasian Eminem, Matt WhitakerMatthew G WhitakerWilliam Barr's only 'flaw' is that he was nominated by Trump Rosenstein, DOJ exploring ways to more easily spy on journalists Pelosi takes power and sets high bar for Trump impeachment MORE."

"Now there is no way to know Whitaker's stance on the Mueller investigation," Colbert said. "Unless you read his op-ed, 'Mueller's investigation of Trump has gone too far,' in which Whitaker wrote that if Mueller looks into Trump's finances it 'could be damaging to the President of the United States ... and by extensions, to the country.'"

He then showed a clip of Whitaker explaining what he thought the president was likely to do regarding the Russia investigation.

"I think that ultimately what the president is going to start doing is putting pressure on Rod RosensteinRod Jay RosensteinBarr’s first task as AG: Look at former FBI leaders’ conduct 5 myths about William Barr William Barr's only 'flaw' is that he was nominated by Trump MORE, who is in charge of the investigation and is acting Attorney General and really try to get Rod to even try to cut the budget of Bob Mueller," Whitaker said on CNN the show.

"Good point," Colbert quipped. "Trump could take all the money away from Bob Mueller and, just out of habit, give it to a porn star."