evidence: Ryan Routh pleaded not guilty to federal charges in connection with an alleged attempt to assassinate Donald Trump at the former president's golf club in Florida. [...] The government argued the sole reason Routh was in West Palm Beach on Sept. 15 was "for one reason and one reason only and that was to kill the former President of the United States." On the day of the alleged attempted assassination, Trump was playing golf on the course when a Secret Service agent spotted a gun barrel poking out from the tree line near the sixth green, according to investigators.