U.S. Authorities Were Warned About Suspected Trump Gunman

Ryan Routh criticized Trump and threatened to kill Vladimir Putin, setting off alarm bells among those involved in Ukraine assistance efforts
The gunman suspected of attempting to assassinate former President Donald Trump acted so erratically during his years as a pro-Ukraine activist that other Americans who encountered him flagged his behavior to U.S. authorities.

Ryan Wesley Routh was taken into custody in Florida on Sunday after Secret Service personnel spotted and opened fire at a man pointing a rifle through the fence at a West Palm Beach club where Trump was golfing. The man fled in a black Nissan and was quickly apprehended.
https://www.wsj.com/us-news/u-s-authorities-were-warned-about-suspected-trump-gunman-153dab6f