Conan O’Brien delivered a reality check to the “F Trump” comedians who, he says, are consumed by anger.

During a sit-down with the Oxford Union on Tuesday, the comedian explained that while he’s repeatedly heard people say that President Donald Trump is “so great for comedy,” he disagrees.

The former late-night TV host argued that because Trump is known for “talking crazy,” it’s more challenging to construct satire about his actions. He pointed to the president’s controversial White House ballroom construction project as something that comedy writers would’ve thought of as a potential sketch if it hadn’t already transpired in real life.

“Comedy needs a straight line to go off of, and we don’t have a straight line right now. We have a very bendy, rubbery line,” he said.

O’Brien made the remarks after he was asked about his “very interesting observations about Trump” and how his “presidency has impacted comedy.”