Trump security boosted weeks ago over Iran assassination plot

Protection for Donald Trump was boosted several weeks ago after US authorities learned of an Iranian plot to kill him.
Officials say there is no known connection between the alleged Iranian plot and the assassination attempt on the former president on Saturday in Pennsylvania.
However, the disclosure that security had been tightened raises further questions over how Thomas Crooks, 20, was able to climb a building and get close enough to fire at Trump.
The US Secret Service and the Trump campaign were notified of the Iranian threat, and security was increased as a result.