Vem Miller, a man arrested near a Trump rally, claims he’s been wrongly accused of trying to kill the former president. Now, he’s suing Riverside County Sheriff Chad Bianco and other officials, saying they ruined his reputation by spreading false information.

Miller was taken into custody at a Trump rally in Coachella, California when police found a shotgun and a handgun in his car. After his arrest, Sheriff Bianco announced that he had stopped a third attempt on Trump’s life, linking Mi...