April 28, 2016: When FBI agents arrested 61-year-old John Martin Roos in White City, Oregon, for threatening federal officials,
including then-President Barack Obama, they found several pipe bombs and guns in his home. In the three months before his arrest, Roos posted at least 34 messages to Twitter about Trump, repeatedly threatening African Americans, Muslims, Mexican immigrants and the "liberal media," and in court documents,
prosecutors noted that the avowed Trump supporter posted this threatening message to Facebook a month earlier: "The establishment is trying to steal the election from Trump. ... Obama is already on a kill list ... Your [name] can be there too." Roos, who is white, has since pleaded guilty to possessing an unregistered explosive device and posting internet threats against federal officials. He was
sentenced to more than five years in prison.