Senior ABC News law enforcement contributor Donald Mihalek discusses the one-year anniversary of then-presidential candidate ...

The report outlines “stunning failures" by Secret Service that allowed the attempted assassination of then-candidate Trump.

In many ways, the assassination attempt against Donald Trump at a Pennsylvania campaign stop was a perfect storm of failings ...

That agent was allegedly warned about would-be assassin Thomas Crooks 25 minutes before Trump was shot — but did not relay ...

The Kentucky senator argued that a lack of oversight paved the way for Secret Service failures at the Pennsylvania event.

Helen Comperatore shares her grief journey after losing her husband Corey in the Trump assassination attempt at the Butler ...

Sunday marks one year since a gunman tried to assassinate then-presidential candidate Donald Trump at a campaign rally in Pennsylvania.

The U.S. Secret Service denied multiple requests for additional resources from President Trump's detail during his campaign, according to a new report on the Butler, Pennsylvania, assassination ...