"Never before in our nation's history has the attorney for the sitting President invoked the 5th Amend in connection with issues surrounding the President," Avenatti

Michael Avenatti, Daniels' attorney, called Cohen's declaration "a stunning development."

"Never before in our nation's history has the attorney for the sitting President invoked the 5th Amend in connection with issues surrounding the President," Avenatti tweeted. "It is esp. stunning seeing as MC served as the 'fixer' for Mr. Trump for over 10 yrs. #basta."

Avenatti told CNN that Cohen invoking the Fifth Amendment only strengthens their case against him.

"The fact finder -- whether it be a jury or a judge -- can find what is called a negative inference and what that means is that you can presume that if the witness answered the question instead of invoking his Fifth Amendment right that the answer would incriminate him that it would not be positive for him or her and that's a very serious matter," Avenatti said on CNN's "Erin Burnett OutFront."

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BREAKING Cohen to plead the Fifth in Stormy Daniels hush money case