Brennan: We know Americans colluded with Russia

Former CIA Director John BrennanJohn Owen BrennanThe curious timeline for taking down Trump Brennan: Russian election interference 'changed the mind of at least one voter' Brennan responds to Trump tweet with advice for diplomats, intelligence agents and 'other courageous patriots' MORE said Thursday that President TrumpDonald John TrumpTrump faces high stakes in meeting with Erdoğan amid impeachment drama Democrats worry they don't have right candidate to beat Trump Trump threatening to fire Mulvaney: report MORE’s claims that no one from his campaign team colluded with Russians are “hogwash,” adding that he knows American citizens were affiliated with Russian spies.

Brennan wrote in The New York Times that he is aware of many “highly suspicious dalliances of some American citizens with people affiliated with the Russian intelligence services.”

Brennan's op-ed comes one day after Trump revoked his security clearance.

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“The only questions that remain are whether the collusion that took place constituted criminally liable conspiracy, whether obstruction of justice occurred to cover up any collusion or conspiracy, and how many members of ‘Trump Incorporated’ attempted to defraud the government by laundering and concealing the movement of money into their pockets,” Brennan wrote.

He noted that Trump's former campaign chairman, Paul ManafortPaul John ManafortEx-Trump campaign official testifies Stone gave updates on WikiLeaks email dumps Paul Manafort's former son-in-law sentenced to 9 years in prison for scamming Dustin Hoffman, others NSC official testified there was 'no doubt' Trump pushed quid pro quo MORE, is currently on trial for bank and tax fraud charges. 

Brennan said Manafort had “deep insight” into Russian activities during Trump’s presidential campaign and thanked the reporting of an “open and free press” for bringing more collusion allegations to light.

It is critical for special counsel Robert MuellerRobert (Bob) Swan MuellerSpeier says impeachment inquiry shows 'very strong case of bribery' by Trump Gowdy: I '100 percent' still believe public congressional hearings are 'a circus' Comey: Mueller 'didn't succeed in his mission because there was inadequate transparency' MORE to be allowed to continue their investigation into Trump’s campaign potentially colluding with Russians and the foreign power’s attempts to influence the election, Brennan wrote.

Trump frequently attacks the Mueller probe as a “witch hunt" and has called on Attorney General Jeff SessionsJefferson (Jeff) Beauregard SessionsMedill dean 'deeply troubled by the vicious bullying and badgering' of student journalists Trump has considered firing official who reported whistleblower complaint to Congress: report Northwestern student paper apologizes for coverage of 'traumatic' Jeff Sessions event MORE to end the investigation. 

“Mr. Trump clearly has become more desperate to protect himself and those close to him, which is why he made the politically motivated decision to revoke my security clearance in an attempt to scare into silence others who might dare to challenge him,” Brennan wrote in the Times.

White House press secretary Sarah Huckabee Sanders on Wednesday denied that the move was intended to silence a Trump critic.

The White House listed Brennan’s “lying” and “frenzied commentary” on the Russia investigation and the administration in revoking of his security clearance.

Trump, however, told The Wall Street Journal late Wednesday that he drew a direct connection between the Mueller probe and his decision to revoke Brennan’s security clearance and is considering pulling the clearances of other former intelligence officials.

The administration has said it is reviewing access to classified information for several former intelligence officials, according to a statement.

They include former Director of National Intelligence James ClapperJames Robert ClapperThe curious timeline for taking down Trump Fairness, tradition, and the Constitution demand the 'whistleblower' step forward Schiff: Barr 'weaponizing' DOJ 'to go after the president's enemies' MORE, former FBI Director James ComeyJames Brien ComeyThere are poor ideas, bad ones and Facebook's Libra Trump has considered firing official who reported whistleblower complaint to Congress: report Broadcast, cable news networks to preempt regular programming for Trump impeachment coverage MORE, former National Security Agency Director Michael Hayden, former Deputy Attorney General Sally YatesSally Caroline YatesMerriam-Webster: A 200-year-old dictionary offers hot political takes on Twitter Sally Yates: Moral fiber of US being 'shredded by unapologetic racism' Trump: 'Impossible for me to know' extent of Flynn investigation MORE, former national security adviser Susan Rice, former FBI Deputy Director Andrew McCabeAndrew George McCabeThe curious timeline for taking down Trump Federal prosecutors interviewed multiple FBI officials for Russia probe review: report Brendan Gleeson lands Trump role in CBS miniseries based on Comey memoir MORE, former FBI agent Peter Strzok, former FBI lawyer Lisa Page and Justice Department official Bruce Ohr.