Sen. Patrick Leahy Patrick Joseph LeahyBipartisan representatives demand answers on expired surveillance programs Democrats shoot down talk of expanding Supreme Court Battle over timing complicates Democratic shutdown strategy MORE (D-Vt.) said Friday that if he were President Trump's lawyer he would require that the president put down Twitter.

"If I was Mr. Trump's lawyer, I'd say I can't continue to represent you unless you gave me all your Twitter equipment and never go on that again," Leahy told MSNBC's Andrea Mitchell.

Leahy was asked about Trump's tweet Friday morning where he lashed out at reports that he is under investigation for obstruction of justice after firing FBI Director James Comey last month.

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Trump said he was “being investigated” for firing Comey "by the man who told me to fire the FBI Director," an apparent reference to Deputy Attorney General Rosenstein.

"President Trump is hurting his own case. Every time he goes on [Twitter] I can just see the special investigator saying, 'Oh, make sure we've got a copy of that one,'" Leahy said on MSNBC.

Leahy is one of Trump's top critics among Senate Democrats. In May, the senior Vermont senator blasted Trump for firing Comey, an act Leahy called "Nixonian."

At the time, Leahy accused Trump of firing the FBI director "in the midst of one of the most critical national security investigations in the history of our country — one that implicates senior officials in the Trump campaign and administration."