Brennan: We know Americans colluded with Russia

Former CIA Director John BrennanJohn Owen BrennanWebb: Questions for Robert Mueller A brief timeline of Trump's clashes with intelligence director Dan Coats Trump critic Brennan praises his Iran decision: I 'applaud' him MORE said Thursday that President TrumpDonald John TrumpPompeo changes staff for Russia meeting after concerns raised about top negotiator's ties: report House unravels with rise of 'Les Enfants Terrible' Ben Carson: Trump is not a racist and his comments were not racist 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 ManafortWebb: Questions for Robert Mueller Top Mueller prosecutor Zainab Ahmad joins law firm Gibson Dunn Russian oligarch's story could spell trouble for Team Mueller 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 MuellerTop Republican considered Mueller subpoena to box in Democrats Kamala Harris says her Justice Dept would have 'no choice' but to prosecute Trump for obstruction Dem committees win new powers to investigate Trump 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 SessionsTrump's no racist; he's an equal opportunity offender Press: Acosta, latest to walk the plank The Hill's Morning Report — Trump retreats on census citizenship question 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 ClapperA brief timeline of Trump's clashes with intelligence director Dan Coats New study suggests Trump's 2016 poll numbers rose after increased Russian troll farm tweets Trump raises 2020 stakes by elevating North Korea, China on agenda MORE, former FBI Director James ComeyJames Brien ComeyFBI's spreadsheet puts a stake through the heart of Steele's dossier Hannity invites Ocasio-Cortez to join prime-time show for full hour The Hill's 12:30 Report: Acosta under fire over Epstein plea deal MORE, former National Security Agency Director Michael Hayden, former Deputy Attorney General Sally YatesSally Caroline YatesTrump: 'Impossible for me to know' extent of Flynn investigation Mueller didn't want Comey memos released out of fear Trump, others would change stories Sally Yates: Trump would be indicted on obstruction of justice if he were not president MORE, former national security adviser Susan Rice, former FBI Deputy Director Andrew McCabeAndrew George McCabeMcCabe says it's 'absolutely' time to launch impeachment inquiry into Trump Feds gone wild: DOJ's stunning inability to prosecute its own bad actors Comey: Trump peddling 'dumb lies' MORE, former FBI agent Peter Strzok, former FBI lawyer Lisa Page and Justice Department official Bruce Ohr.