Former CIA Director John BrennanJohn Owen BrennanWebb: Questions for Robert Mueller A brief timeline of Trump's clashes with intelligence director Dan Coats Trump critic Brennan praises his Iran decision: I 'applaud' him MORE lauded former President George H.W. Bush after his death, honoring his “public service, integrity, and determination.”

Political figures of all stripes have memorialized Bush, 94, after the 41st president's death was announced late Friday.

“George H.W. Bush led a life of exemplary public service, integrity, and determination—in WWII, in Congress, as UN Ambassador, Envoy to China, CIA Director, and as Vice President & President,” Brennan wrote in his remembrance.

“A life very well lived; an American who made us all proud. May he rest in eternal peace,” he added.

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Brennan has served presidents from both parties, working in every administration since Bill ClintonWilliam (Bill) Jefferson ClintonNo presidential candidate can unite the country Lindsey Graham's Faustian bargain Military spending has many points of contention: Closing overseas bases isn't one of them MORE’s, with the exception of President TrumpDonald John TrumpCould Donald Trump and Boris Johnson be this generation's Reagan-Thatcher? Merkel backs Democratic congresswomen over Trump How China's currency manipulation cheats America on trade MORE.

He served in the CIA and directed the National Counterterrorism Center for Bush’s son, former President George W. Bush. He was later homeland security adviser and CIA director under former President Obama.

George H.W. Bush, like Brennan, ran the CIA, serving under President Gerald Ford when the position’s title was director of central intelligence.

Brennan, who describes himself on Twitter as a “nonpartisan American who is very concerned about our collective future,” has emerged as one of Trump’s fiercest critics.

Trump was among the political figures honoring Bush early Saturday morning after his death, saying he “inspired generations of his fellow Americans to public service.”