So long as the U.S. has an imperial presidency, lots of people will want to be close to the emperor. After seeing the way Trump treated many of the people he hired during his first term as president, it’s not unreasonable to wonder who in his right mind would want to serve in a potential second Trump administration. Trump prizes loyalty, but the first Republican senator to endorse him in 2016, Jeff Sessions, soon fell out with Trump after a tumultuous tenure as attorney general. Rex...