Former CIA director says he warned Russia against meddling in the presidential election in August. (May 23) AP

After former CIA director John Brennan penned a scathing op-ed in The Washington Postattacking President Trump, the commander-in-chief fired back on Twitter Saturday, citing one of his favorite cable news shows, Fox & Friends.

“John Brennan, no single figure in American history has done more to discredit the intelligence community than this liar,” Trump tweeted quoting conservative commentator Dan Bongino who appeared on the TV show early Saturday. “Not only is he a liar, he’s a liar about being a liar.”

Bongino went after Brennan, saying the former CIA official lied about his knowledge of a dossier that contained salacious and unsubstantiated allegations that Trump met with prostitutes in a Moscow hotel room.

The Trump-approved criticism comes a day after Brennan bashed Trump’s “lifelong pre-occupation with aggrandizing himself.”

“John Brennan, no single figure in American history has done more to discredit the intelligence community than this liar. Not only is he a liar, he’s a liar about being a liar.” Dan Bongino on @foxandfriends

— Donald J. Trump (@realDonaldTrump)…