Joe Kent, who resigned Tuesday as National Counterterrorism Center director, has been a stalwart Trump supporter, backing him since his 2016 campaign, through his 2020 election defeat, the Jan. 6 riots, as well as during his own conservative media advocacy and two failed congressional bids. But that ended with Mr. Trump's war in Iran and his alliance with Israel against the Islamic clerics who led the Tehran government. In a resignation letter he posted on X, Kent said Tuesday that Iran "posed no imminent threat to our nation," and he asserted that "we started this war due to pressure from...