Brennan: We know Americans colluded with Russia

Former CIA Director John BrennanJohn Owen BrennanDOJ attorney looking into whether CIA withheld info during start of Russia probe: NYT Federal prosecutor looking into Brennan's role in Russian interference findings: report FISA court's rebuke of the FBI: It broke or ignored the rules and our rights MORE said Thursday that President TrumpDonald John TrumpChasten Buttigieg: 'I've been dealing with the likes of Rush Limbaugh my entire life' Lawmakers paint different pictures of Trump's 'opportunity zone' program We must not turn our heads from the effects of traumatic brain injuries 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 ManafortFree Roger Stone Trump tweets test Attorney General Barr Maxine Waters blasts Trump as 'mafia boss' over Stone case 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 MuellerCNN's Toobin warns McCabe is in 'perilous condition' with emboldened Trump CNN anchor rips Trump over Stone while evoking Clinton-Lynch tarmac meeting The Hill's 12:30 Report: New Hampshire fallout 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 SessionsOn the Trail: Senate GOP hopefuls tie themselves to Trump Trump looms as flashpoint in Alabama Senate battle Trump tweets test Attorney General Barr 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 ClapperFree Roger Stone The risk of a politicized national intelligence director CNN's Toobin warns McCabe is in 'perilous condition' with emboldened Trump MORE, former FBI Director James ComeyJames Brien ComeyTrump decries lack of 'fairness' in Stone trial ahead of sentencing Blagojevich heaps praise on Trump after release from prison Free Roger Stone MORE, former National Security Agency Director Michael Hayden, former Deputy Attorney General Sally YatesSally Caroline YatesGraham requests interviews with DOJ, FBI officials as part of probe into Russia investigation Sally Yates blasts Trump for using DOJ as 'personal grudge squad' Biden: 'I sure would like Michelle to be the vice president' MORE, former national security adviser Susan Rice, former FBI Deputy Director Andrew McCabeAndrew George McCabeGraham: Trump has 'all the legal authority in the world' to pardon Stone Trump decries lack of 'fairness' in Stone trial ahead of sentencing Free Roger Stone MORE, former FBI agent Peter Strzok, former FBI lawyer Lisa Page and Justice Department official Bruce Ohr.