Michael Cohen said there’s an easy way to spot when Donald Trump is lying, and you don’t have to read the former president’s lips.

Just watch his hands.

“When you see the accordion hands start going, what that means is that he’s lying,” Cohen, who was Trump’s longtime fixer and personal attorney, told CNN’s Jim Acosta on Tuesday. “It’s a tell with Donald. Anytime that the accordion hands start, that means that he’s not telling the truth.”

Cohen spoke with Acosta about Trump’s on-again, off-again debate with Vice President Kamala Harris, which seems to be back on even though the two camps are still arguing over whether the mics should be muted when they are not speaking.

The Harris camp wants the mics on all the time, and Trump has said that’s OK with him.

But his campaign wants them off for the Sept. 10 debate.

Cohen said there’s a reason for that.

“They don’t trust that he’s gonna keep his mouth shut and he won’t stay normal for the 90 minutes of the debate,” Cohen said.

Cohen said Trump ― despite what he says ― doesn’t want the mics on, either.

“He knows he can’t control himself,” he said. “He says things under his breath, he’s gonna continuously interrupt Kamala every time she says something that he doesn’t agree with. He can’t help himself.”

See more of that conversation below: