Brennan condemned the assassination of Iran's top nuclear scientist Mohsen Fakhrizadeh, which Tehran has blamed Israel for.
"I know that Texans have a well-deserved reputation for calling out BS, especially when shoveled by a snake oil salesman like Donald Trump," said John O. Brennan.
Vice President Mike Pence "lied about handwritten notes of mine from 2016 that referenced unsubstantiated Russian allegation about Secretary Clinton" during his debate with Senator Kamala Harris, former CIA Director John Brennan tweeted on Wednesday night.
John Brennan said Trump would quit the White House "if he had a soul or a conscience" in the wake of details from Woodward's book.
In a recent interview, Sen. John Kennedy again claimed that Ukraine interfered in the 2016 election.
John Brennan, who served under Barack Obama, told MSNBC's Nicolle Wallace that he was worried about the "dysfunctionality of our government at this time."
"It reveals that there is no process in this administration, there is no serious policymaking process," former CIA Director John Brennan said.
John Brennan, the former CIA director, said losing Sue Gordon and Dan Coats on the same day is "basically decapitating the intelligence community."
Longtime Trump confidante Roger Stone posted a message calling for former CIA Director John Brennan to be "hung for treason" Saturday night.
"If he's working towards a deal, as you say, it's a deal we don't know about," John Brennan said. "He basically said he wants denuclearization. That is not going to happen."
Former CIA Director John Brennan said the attorney general's behavior suggests "he is acting as Donald Trump's personal lawyer."
Former CIA Director John Brennan has no doubt Trump will pardon Paul Manafort, the only question is "when."
Brennan said he expected "the final indictments, as well as the report to the attorney general" very soon.
The special counsel's probe could hit the very top of the Trump campaign, said former CIA Director John Brennan.
"He [Trump] acts like he has an ulterior motive that is not apparent," former CIA Director John Brennan said in an interview with MSNBC.
John Brennan agreed with an assessment that President Donald Trump was a danger to the country's national security.
"I'm hoping that maybe this is a turning point," former CIA Director John Brennan said.
"Trump is trying to punish Brennan and others for criticizing him and that is a crime in monarchies like Saudi Arabia," the CIA historian said.
"I have seen the lights blinking red in terms of what Mr. Trump has done and is doing," said John Brennan, former CIA chief.
"It's kind of weird," Conway said.
"The president thinks that John Brennan launched the whole investigation, and now he's got a chance to do something. Boom, he did," Fox & Friends co-host Steve Doocy said.
The president has been widely criticized after he took the unprecedented step of revoking Brennan's security clearance, and threatening to pull the security clearance of others.
Trump revoked the ex-CIA director's security clearance.
The president has faced backlash over his decision to revoke John Brennan's security clearance.