On Monday night, Stephen Colbert slammed President Trump for several of his most recent tweets.

He mocked Trump for referring to himself as “T.”

“Who the hell is ‘T?'” Colbert asked. “You know there’s already a letter for when you’re talking about yourself. It’s ‘I’ as in ‘I don’t believe anyone calls you ‘T!’ You can’t give yourself a nickname!”

The Late Show host then mocked Trump’s tweet that accused President Obama of “colluding or obstructing” during the election.

“Hold on,” Colbert continued. “Nobody is accusing Obama of colluding or obstructing. That’s your deal.”

He moved on to another tweet where Trump said he should be “given an apology” because there has been no collusion and no obstruction.

“I’m a big enough man to apologize,” he replied. “And I believe I speak for the majority of Americans when I say this: I’m sorry you’re president.”

Watch the clip above, via CBS.

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