President Trump’s call for Sen. Susan Collins (R) to be ousted in November tossed a monkey wrench into the high-stakes Maine Senate race, raising further questions about the GOP’s most vulnerable incumbent and whether she will be able to pull off another high-wire act in the blue-leaning state this year. Frustrations at the White House boiled over on Thursday after Collins and four other Republicans sided with Democrats on a war powers resolution that would block further military action in Venezuela. While Republicans were miffed at the attack on the handful of members, it’s Collins they are most concerned with...