At least 13 former senior intelligence officials in a joint statement on Friday blasted 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 for his decision to revoke 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’s security clearance — and for his warnings that other former officials could meet the same fate.

“We all agree that the president’s action regarding John Brennan and the threats of similar action against other former officials has nothing to do with who should and should not hold security clearances — and everything to do with an attempt to stifle free speech,” they write, according to a copy of the statement obtained by The Hill.

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The officials said they issued the statement because they felt compelled to respond to the president's “ill-considered” remarks and actions.

“We have never before seen the approval or removal of security clearances used as a political tool, as was done in this case,” the statement continues, calling the president’s move this week a “signal to other former and current officials.”

The signatures include 12 former CIA directors and deputy directors, as well as one former director of national intelligence. The tenures of the former CIA chiefs who signed the statement span across every administration starting in 1987.

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The letter is signed by former CIA Directors David Petraeus, Leon Panetta, Michael Hayden, Porter Goss, George Tenet, Robert Gates and William Webster; former CIA Deputy Directors David Cohen, Avril Haines, Michael Morell, Stephen Kappes and John McLaughlin; and former Director of National Intelligence

CNN reported Friday that former Director of National Intelligence Dennis Blair, who served during the Obama administration, and former Deputy CIA Director Bert Calland also added their names to the list.

A source familiar with the matter told The Hill on Friday that another letter is circulating among former officials who held agency positions below the role of deputy director, another sign of pushback.

Two of the signatories of the statement, Hayden and Clapper, are among those whose security clearances are under review by the White House, according to a list read by press secretary Sarah Huckabee Sanders on Wednesday. Like Brennan, both men have fiercely criticized the president.

Hayden, who served as the head of the CIA under during the George W. Bush and Obama administrations, has become a prominent opponent of the Trump White House.

From warning officials not to work for the Trump administration to questions about the president’s mental stability, Hayden’s caustic remarks appear to have captured the attention of the White House.

Clapper, who served as director of national intelligence during the Obama administration, has similarly emerged as one Trump’s vocal detractors on cable news.

Clapper became a target of the president’s ire earlier this year over the controversy that Trump has dubbed “Spygate.” The president and his allies were seeking to learn more information about an FBI informant who reportedly met with a handful of Trump campaign aides during the 2016 presidential race.

Clapper maintained that the source did not infiltrate Trump’s campaign for political purposes. Clapper said the FBI was conducting surveillance on the Russians, but the president twisted his words to claim the government was spying on his campaign.

“Clapper has now admitted that there was Spying in my campaign. Large dollars were paid to the Spy, far beyond normal. Starting to look like one of the biggest political scandals in U.S. history. SPYGATE — a terrible thing!” Trump tweeted in late May.

Gates, who served as the CIA director under former President George H.W. Bush and Defense secretary to both Presidents George W. Bush and Obama, signed on as well. His criticism against the White House has been neither as frequent nor as fiery as some of the other former officials, but he hasn’t been afraid to take a few public punches.

During the 2016 campaign, Gates wrote a scathing opinion piece where he hit Trump as “being beyond” repair, but he also criticized Democratic presidential nominee Hillary Clinton Hillary Diane Rodham ClintonFox News poll: Biden ahead of Trump in Nevada, Pennsylvania and Ohio Trump, Biden court Black business owners in final election sprint The power of incumbency: How Trump is using the Oval Office to win reelection MORE for her “much-discussed credibility” issues.

“A thin-skinned, temperamental, shoot-from-the-hip and lip, uninformed commander-in-chief is too great a risk for America,” Gates wrote in The Wall Street Journal in September 2016, weeks before Election Day.

Gates’s career in the national security apparatus spans multiple decades, first joining the CIA as a analyst in 1966.

Like Gates, several officials on the statement also worked in both Democratic and Republican administrations as agency heads, including Tenet, who formerly lead the CIA during the Clinton and George W. Bush administrations.

Panetta served as President Clinton's chief of staff before becoming the CIA director in the Obama administration.

Gen. David Petraeus, the latest former CIA chief to sign on to the statement, served during the Obama administration after an extensive career in the U.S. Army. He resigned after about a year into his role as CIA chief, citing personal reasons and admitting to an extramarital affair.

Webster served as the director of the CIA during part of the Reagan administration. He is the predecessor to all the other CIA chiefs who signed on to the remarks.

“Decisions on security clearances should be based on national security concerns and not political views,” the statement reads.

Trump, however, pushed back on this notion on Friday, claiming he is actually giving his critics a bigger platform.

“I'm giving them a bigger voice ... and that's OK with me because I like taking on voices like that,” the president said, adding he has “never respected” Brennan.

The president's comments come two days after he revoked Brennan’s security clearance, a move he says is tied to the CIA chief’s involvement in the Russia probe.

“I say it, I say it again: That whole situation is a rigged witch hunt,” Trump told reporters, referring to 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's investigation into Russian election interference. “It's a totally rigged deal. They should be looking at the other side.”

While the administration faced powerful blowback from the intelligence community and Democrats for his Brennan move, Trump appears undeterred.

He told reporters Friday that he is expecting to revoke the security clearance of Bruce Ohr, a current Justice Department official who has come under increasing GOP fire for his ties to the controversial Steele dossier.