Former CIA Director John Brennan John Owen BrennanJournalism or partisanship? The media's mistakes of 2016 continue in 2020 Comey on Clinton tweet: 'I regret only being involved in the 2016 election' Ex-CIA Director Brennan questioned for 8 hours in Durham review of Russia probe MORE said Thursday that President Trump Donald John TrumpSteele Dossier sub-source was subject of FBI counterintelligence probe Pelosi slams Trump executive order on pre-existing conditions: It 'isn't worth the paper it's signed on' Trump 'no longer angry' at Romney because of Supreme Court stance 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 Manafort Paul John ManafortOur Constitution is under attack by Attorney General William Barr Bannon trial date set in alleged border wall scam Conspicuous by their absence from the Republican Convention 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 Mueller Robert (Bob) 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 Sessions Jefferson (Jeff) Beauregard SessionsRoy Moore sues Alabama over COVID-19 restrictions GOP set to release controversial Biden report Trump's policies on refugees are as simple as ABCs 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 Clapper James Robert ClapperOn China, Biden is no Nixon — and no Trump The Hill's 12:30 Report - Speculation over Biden's running mate announcement Trump slams former intelligence officials to explain 'reluctance to embrace' agencies MORE, former FBI Director James Comey James Brien ComeySteele Dossier sub-source was subject of FBI counterintelligence probe Judge will not dismiss McCabe's case against DOJ Democrats fear Russia interference could spoil bid to retake Senate MORE, former National Security Agency Director Michael Hayden, former Deputy Attorney General Sally Yates Sally Caroline YatesButtigieg, former officials added to Biden's transition team The Hill's 12:30 Report: Delegates stage state-centric videos for the roll call Trump fires back at Yates for convention speech: 'Terrible AG' MORE, former national security adviser Susan Rice, former FBI Deputy Director Andrew McCabe Andrew George McCabeJudge will not dismiss McCabe's case against DOJ Graham: Comey to testify about FBI's Russia probe, Mueller declined invitation Barr criticizes DOJ in speech declaring all agency power 'is invested in the attorney general' MORE, former FBI agent Peter Strzok, former FBI lawyer Lisa Page and Justice Department official Bruce Ohr.