Brennan: We know Americans colluded with Russia

Former CIA Director John BrennanJohn Owen BrennanNew book: Putin tried to reinforce Trump’s belief in a ‘deep state’ undermining him Retired admiral resigned from Pentagon advisory committee after writing open letter to Trump Rand Paul ramps up his alliance with Trump MORE said Thursday that President TrumpDonald John TrumpTrump rallies in Nevada amid Supreme Court flurry: 'We're gonna get Brett' Trump: 'Good news' that Obama is campaigning again Trump boosts Heller, hammers 'Wacky Jacky' opponent in Nevada 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 ManafortCohen questioned for hours in Mueller probe about Trump's dealings with Russia: report Vote Democrat in midterms to rein in Trump, preserve justice Hillicon Valley: Trump's exclusive interview with Hill.TV | Trump, intel officials clash over Russia docs | EU investigating Amazon | Military gets new cyber authority | Flynn sentencing sparks new questions about Mueller probe 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 Swan MuellerSasse: US should applaud choice of Mueller to lead Russia probe 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 SessionsHillicon Valley: Trump cyber strategy lets US go on offense | AT&T urges court to let Time Warner merger stand | Conservatives want wife of DOJ official to testify | Facebook, nonprofits team up to fight fake news | DC camera hacker pleads guilty Vote Democrat in midterms to rein in Trump, preserve justice Sessions limits ability of judges to dismiss deportation cases 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 ClapperFBI memos detail ‘partisan axes,’ secret conflicts behind the Russia election meddling assessment Foreign hackers a legitimate concern for ballot machines, says cybersecurity expert Dem strategist: 'Genuine concern' Russia will escalate interference efforts in 2018 MORE, former FBI Director James ComeyJames Brien ComeyFBI memos detail ‘partisan axes,’ secret conflicts behind the Russia election meddling assessment New grounds for impeachment? House Dem says Trump deserves it for making society worse Sessions gets unexpected support - from a Democrat who wants to impeach Trump MORE, former National Security Agency Director Michael Hayden, former Deputy Attorney General Sally YatesSally Caroline YatesTime for sunshine on Trump-Russia investigation New Yorker disinvites Bannon from festival following backlash White House confirms Brennan's security clearance has been revoked MORE, former national security adviser Susan Rice, former FBI Deputy Director Andrew McCabeAndrew George McCabeCBS in talks for miniseries based on Comey book EXCLUSIVE: Trump says exposing ‘corrupt’ FBI probe could be ‘crowning achievement’ of presidency Former FBI Deputy Director Andrew McCabe lands book deal MORE, former FBI agent Peter Strzok, former FBI lawyer Lisa Page and Justice Department official Bruce Ohr.