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 on Tuesday tweeted that 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 fails “to live up to minimum standards of decency, civility, & probity” in response to his tweet calling former White House aide Omarosa Manigault Newman Omarosa Onee Manigault NewmanTrump hurls insults at Harris, Ocasio-Cortez and other women Pelosi makes fans as Democrat who gets under Trump's skin The Memo: Impeachment's scars cut deep with Trump, say those who know him MORE a “dog.”

It’s astounding how often you fail to live up to minimum standards of decency, civility, & probity. Seems like you will never understand what it means to be president, nor what it takes to be a good, decent, & honest person. So disheartening, so dangerous for our Nation. https://t.co/eI9HaCec1m — John O. Brennan (@JohnBrennan) August 14, 2018

Brennan’s tweet was a quote-tweet of Trump, who escalated his attacks on Manigault Newman earlier Tuesday over the claims made in her newly released memoir, "Unhinged: An Insider's Account of the Trump White House."

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"When you give a crazed, crying lowlife a break, and give her a job at the White House, I guess it just didn’t work out. Good work by General Kelly for quickly firing that dog!" Trump wrote on Twitter.

Manigault Newman has been criticizing Trump during a media tour to promote her new book, which makes a number of noteworthy claims about the Trump White House. Manigault Newman also released secretly recorded tapes of Trump and White House chief of staff John Kelly John Francis KellyMORE earlier this week, which White House officials have called a breach of national security.

Trump and Manigault Newman have been trading attacks since late last week, when excerpts from her book began to be published.

Brennan’s criticism on Tuesday of Trump marks his second time ripping the president on Twitter in as many days. Brennan also tweeted at Trump on Monday after the president called Manigault Newman a "lowlife" on Twitter.

“If you were ‘presidential,’ you would focus on healing the rifts within our Nation,” Brennan tweeted, “being truthful about the challenges we face, & showing the world that America is still that shining beacon of freedom, liberty, prosperity, & goodness that welcomes all.”

Brennan has been a frequent Trump critic during his presidency, writing in an op-ed in The Washington Post earlier this year that he will continue to criticize the president “until integrity returns to the White House.”