MONTICELLO, Fla. — On the campaign trail in Florida farm country, a longshot Republican candidate for governor is selling $40 T-shirts that say “No American should die for Israel.” A few hours west, Laura Loomer, the far-right media figure, is preparing a pitch to donors to help fund a new outlet: a weekly newsletter taking on the right-wing podcasters critical of Israel. Rarely is foreign policy a major political issue in a midterm election year. But the war in Iran has helped turn the U.S. relationship with Israel into a marquee topic among Republicans, pushing allies of President Donald Trump like Loomer to escalate their attacks on conservative critics of the relationship and creating new fault lines on America’s far right. “It’s like a psychosis. It’s literally a psychosis,” Loomer said in an interview last week, referring to the turn against Israel among some conservatives.…