Donald Trump’s current lawyer attacks the president’s one-time lawyer on Thursday.

Rudy Giuliani, the former mayor of New York City and Trump’s television defense lawyer, lashed out against Michael Cohen.

Cohen will be publicly testifying before the House Committee on Oversight and Reform, chaired by Rep. Elijah Cummings (D-MD).

Giuliani reportedly referred to Cohen as “a thoroughly discredited liar” and said he “doesn’t know a damn thing about collusion.”

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He also denied that Trump had committed impeachment offenses of high crimes or misdemeanors.

Giuliani’s comments were recorded by Fox News producer Pat Ward.

Rudy Giuliani tells Fox News he can't imagine why Elijah Cummings would want to hear testimony from Michael Cohen before Congress, as he is, "a thoroughly discredited liar." per @johnrobertsFox — Pat Ward (@WardDPatrick) January 10, 2019

On the issue of possible collusion between the Trump campaign and Russia, Giuliani says, "Cohen doesn't know a damn thing about collusion." — Pat Ward (@WardDPatrick) January 10, 2019

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Asked whether he thought this could be the first stepping stone toward impeaching the President, Giuliani tells Fox News there is nothing to base impeachment on, that there is "no evidence of high crimes or misdemeanors" in anything that we have heard from Mueller so far. — Pat Ward (@WardDPatrick) January 10, 2019