Vice President JD Vance is projecting loyalty to Donald Trump as the president leads the United States into the type of war the Iraq veteran didn’t want — and as the new conflict complicates Vance’s political future. Vance allies have played down the impact the operation in Iran could have on his presidential ambitions, insisting that a mission involving the U.S. military only for a matter of weeks won’t stay in voters’ memories. People close to the vice president have also conceded to The Washington Post, however, that a months-long conflict will pose a problem for whoever is the next...