Joe Kent, the director of the United States' National Counterterrorism Center, announced his resignation on Tuesday, saying he "cannot in good conscience" back the Trump administration's war in Iran.
Kent is the first senior US official to resign from the Trump administration to protest the war against Iran.
Announcing his resignation via X, Kent wrote that Iran "posed no imminent threat to our nation, and it is clear that we started this war due to pressure from Israel and its powerful American lobby."
"Until June of 2025, you understood that the wars in the Middle East were a trap that robbed America of the precious lives of our patriots and depleted the wealth and prosperity of our nation," Kent said in his letter to Trump.
"Early in this administration, high-ranking Israeli officials and influential members of the American media deployed a misinformation campaign that wholly undermined your America First platform and sowed pro-war sentiments to encourage a war with Iran," he said.
"This echo chamber was used to deceive you into believing that Iran posed an imminent threat to the United States, and that should you strike now, there was a clear path to a swift victory," he said.
"This was a lie and is the same tactic the Israelis used to draw us into the disastrous Iraq war that cost our nation the lives of thousands of our best men and women," Kent said.
"I cannot support sending the next generation off to fight and die in a war that serves no benefit to the American people nor justifies the cost of American lives," he added.
Kent, a former political candidate with connections to right-wing extremists, was confirmed to his post last July on a 52-44 vote.
As head of the National Counterterrorism Center, Kent was in charge of an agency tasked with analyzing and detecting terrorist threats.
Before entering US President Donald Trump's administration, Kent ran two unsuccessful campaigns for Congress in Washington state. He also served in the military, seeing 11 deployments as a Green Beret, followed by work at the CIA.
Democrats strongly opposed Kent's confirmation, pointing to his past ties to far-right figures and conspiracy theories. During his 2022 congressional campaign, Kent paid Graham Jorgensen, a member of the far-right military group the Proud Boys, for consulting work. He also worked closely with Joey Gibson, the founder of the Christian nationalist group Patriot Prayer, and attracted support from a variety of far-right figures.
During his Senate confirmation hearing, Kent also refused to distance himself from a conspiracy theory that federal agents instigated the Jan. 6, 2021, attack at the Capitol, as well as false claims that Trump, a Republican, won the 2020 election over Democrat Joe Biden.
Democrats grilled Kent on his participation in a group chat on Signal that was used by Trump's national security team to discuss sensitive military plans.
(With inputs form AP and AFP)