A 32-year-old man from Butler, Pennsylvania, has been arrested and charged by federal authorities after allegedly making multiple online threats to assassinate President Donald J. Trump and other U.S. officials. The suspect, identified as Shawn Monper, was taken into custody by the FBI and Butler Township Police after investigators traced a series of violent messages posted to YouTube under the username “Mr Satan.” According to a criminal complaint filed in federal court, Monper made threats against the former president, Immigration and Customs Enforcement (ICE) agents, and various U.S. officials over a span of several months. The case is particularly alarming...