Retired Air Force general Michael Hayden was hospitalized after suffering a stroke, his family said Friday.

“He is receiving expert medical care for which the family is grateful,” according to a statement issued by his namesake organization. “The General and his family greatly appreciate the warm wishes and prayers of his friends, colleagues, and supporters.”

Hayden, 73, served as director of the Central Intelligence Agency and National Security Agency during the George W. Bush and Barack Obama administrations. He retired from the CIA in 2009.

Hayden has been a vocal critic of Donald Trump’s campaign and presidency. Earlier this year, after Trump decided to revoke the security clearance of former CIA director John Brennan, Hayden was one of several former intelligence leaders to sign a statement in opposition. Criticizing the president for crossing a line, he quickly became one of the individuals whose security clearance Trump threatened to review.

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