US President Donald Trump speaks as US Secretary of State Mike Pompeo (L) and US Deputy Secretary of Defense Patrick M. Shanahan look on during a cabinet meeting in the Cabinet Room of the White House on August 16, 2018 in Washington, DC. (Photo by Mandel NGAN / AFP)        (Photo credit should read MANDEL NGAN/AFP/Getty Images)
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Sixty former CIA officials warned President Donald Trump in a statement on Friday that “the country will be weakened if there is a political litmus test applied before seasoned experts are allowed to share their views.”

The letter, which comes after Trump’s decision to revoke former CIA Director John Brennan’s security clearance, was signed by former CIA officials who served under both Republican and Democratic administrations in positions such as analysts, senior analysts and officers.

It adds to a growing outcry against the President’s recent action and comes after more than a dozen former senior intelligence officials denounced the move as “ill-considered” and “unprecedented” in a separate statement.

“All of us believe it is critical to protect classified information from unauthorized disclosure,” reads the statement from the former CIA officials. “But we believe equally strongly that former government officials have the right to express their unclassified views on what they see as critical national security issues without fear of being punished for doing so.”

The statement goes on to say, “Our signatures below do not necessarily mean that we concur with the opinions expressed by former Director Brennan or the way in which he expressed them. What they do represent, however, is our firm belief that the country will be weakened if there is a political litmus test applied before seasoned experts are allowed to share their views.”

The President announced his decision to revoke Brennan’s clearance on Wednesday and accused the former CIA chief, who has been a prominent critic of Trump, of “lying” and giving “increasingly frenzied commentary,” which the President described as “wholly inconsistent with access to the nation’s most closely held secrets.”

Later, however, Trump connected his move to strip Brennan’s security clearance to the Russia investigation during an interview with the Wall Street Journal, saying the probe was a “witch hunt” and “these people led it.”

The President has said he is considering revoking the security clearances of other individuals as well.

CNN’s Veronica Stracqualursi contributed to this report.