Stormy Daniels’s lawyer, Michael Avenatti, said on Sunday that he will prove that President Trump Donald John TrumpOmar fires back at Trump over rally remarks: 'This is my country' Pelosi: Trump hurrying to fill SCOTUS seat so he can repeal ObamaCare Trump mocks Biden appearance, mask use ahead of first debate MORE knew about the nondisclosure agreement between Trump's personal lawyer, Michael Cohen, and the adult-film actress.

Avenatti said on CNN’s “State of the Union” that he didn't think Trump learned about the agreement through media coverage.

“I don't think that's possible and I don't think it's probable. And I think, at the end of the day, we're going to be able to prove that the president knew about the agreement and knew about the $130,000,” Avenatti said.

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Avenatti argued that Trump's comment last week that Cohen represented him in issues with Daniels showed that the president knew of Cohen’s involvement with Daniels and the original agreement.

Avenatti asked: “How could Michael Cohen have represented the president if the president never knew anything about it?”

“It’s a critical mistake and this is what happens when you are undisciplined in litigation,” Avenatti added.

“You may be able to be undisciplined in politics, you may be able to lie to the press and the American people, but you can’t lie in litigation," he added. "It comes back and bites you every time.”

Daniels, whose real name in Stephanie Clifford, is currently suing Trump to formally void the nondisclosure agreement she signed with Cohen just weeks before the 2016 election. She says the $130,000 payment was meant to buy her silence about an alleged affair with Trump a decade ago. Daniels is also suing Cohen for defamation.