Law enforcement agents alerted Secret Service to concerns with the building Crooks shot from, to which agents allegedly replied they would "take care of it."

Local law enforcement told Senate investigators that the Secret Service said it would handle security at the buildings near Donald Trump’s Pennsylvania rally site flagged repeatedly for security risks, according to a new letter Wednesday from Iowa GOP Sen. Chuck Grassley to the acting Secret Service director.

Examine the timeline of events from an apparent second attempt at the former president's life.