Former Vice President Joe Biden Joe BidenPelosi slams Trump executive order on pre-existing conditions: It 'isn't worth the paper it's signed on' Hillicon Valley: Subpoenas for Facebook, Google and Twitter on the cards | Wray rebuffs mail-in voting conspiracies | Reps. raise mass surveillance concerns Fox News poll: Biden ahead of Trump in Nevada, Pennsylvania and Ohio MORE on Wednesday hit back at President Trump Donald John TrumpSteele Dossier sub-source was subject of FBI counterintelligence probe Pelosi slams Trump executive order on pre-existing conditions: It 'isn't worth the paper it's signed on' Trump 'no longer angry' at Romney because of Supreme Court stance MORE for revoking 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’s security clearance.

In a tweet, Biden warned the president that revoking Brennan’s clearance won’t “silence” the frequent Trump critic.

“In the time I have known him, John Brennan has never been afraid to speak up and give it to you straight,” Biden tweeted. “Revoking his security clearance is an act unbecoming of a President. If you think it will silence John, then you just don't know the man.”

In the time I have known him, John Brennan has never been afraid to speak up and give it to you straight. Revoking his security clearance is an act unbecoming of a President. If you think it will silence John, then you just don't know the man. — Joe Biden (@JoeBiden) August 15, 2018

Trump announced Wednesday that he was revoking Brennan’s clearance, following through on what he said last month was under consideration.

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In a statement read by White House press secretary Sarah Huckabee Sanders during a briefing, Trump painted the move as necessary to protect national security interests.

Brennan, who served under former President Obama, is one of several former top officials who have become harsh critics of the administration. Trump is also considering revoking security clearance for a number of others.

The former CIA chief wrote in a tweet that the president’s decision is part of an effort to “suppress freedom of speech and punish critics.”

He said on MSNBC that he found out about his clearance being revoked when he saw it on television, and has not heard from any White House officials.