Former CIA Director John Brennan John Owen BrennanJournalism or partisanship? The media's mistakes of 2016 continue in 2020 Comey on Clinton tweet: 'I regret only being involved in the 2016 election' Ex-CIA Director Brennan questioned for 8 hours in Durham review of Russia probe MORE spoke out against President Trump Donald John TrumpOmar fires back at Trump over rally remarks: 'This is my country' Pelosi: Trump hurrying to fill SCOTUS seat so he can repeal ObamaCare Trump mocks Biden appearance, mask use ahead of first debate MORE on Twitter Saturday afternoon after the president called former Director of National Intelligence James Clapper James Robert ClapperOn China, Biden is no Nixon — and no Trump The Hill's 12:30 Report - Speculation over Biden's running mate announcement Trump slams former intelligence officials to explain 'reluctance to embrace' agencies MORE a "lying machine."

Brennan, who served alongside Clapper under former President Obama, defended his former colleague as a "man of integrity, honesty, ethics, & morality."

"Mr. Trump: Your hypocrisy knows no bounds. Jim Clapper is a man of integrity, honesty, ethics, & morality. You are not. Jim Clapper served his country for over a half century, including in Vietnam. You did not. By your words & behavior, you diminish the Office of the Presidency," he tweeted.

Mr. Trump: Your hypocrisy knows no bounds. Jim Clapper is a man of integrity, honesty, ethics, & morality. You are not. Jim Clapper served his country for over a half century, including in Vietnam. You did not. By your words & behavior, you diminish the Office of the Presidency. https://t.co/bYlmZInDoM — John O. Brennan (@JohnBrennan) April 28, 2018

Trump attacked Clapper on Twitter Saturday morning after a Republican report released Friday by members of the House Intelligence Committee stated that Clapper had discussed the bombshell "Steele dossier" about Trump and Russia with CNN reporters, including anchor Jake Tapper, in 2017.

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Clapper had previously "flatly denied" leaking the contents of the dossier, but ultimately admitted to discussing the dossier with Tapper and other journalists shortly before Trump's inauguration in January 2017, the report states.

"Clapper’s discussion with Tapper took place in 'early January 2017,' around the time [intelligence officials] briefed President Obama and President-elect Trump, on 'the Christopher Steele information,'” the document notes.

Clapper and Brennan have been vocal critics of the president, joining other former members of the Obama administration in lambasting Trump on social media. Clapper joined CNN as a network contributor in August 2017.