Former New York City Mayor Rudy Giuliani on CNN (screengrab)
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."
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.
