Communications gaps, unguarded warehouses and a lack of written instructions opened an opportunity for a gunman at a rally in Butler, Pa., in July.

Rep. Ro Khanna, a California Democrat, on Sunday demanded the Secret Service return to Congress to testify over the second assassination attempt on former President Donald Trump, calling the

Former President Trump has the highest levels of security, acting Secret Service Director Ronald Rowe told reporters Monday, crediting the agency with thwarting an alleged would-be assassin from

An internal investigation has confirmed security breakdowns that paved the way for an attempted assassination of Donald Trump, and revealed new failures.

Acting Secret Service Director Ronald Rowe spoke with lawmakers Thursday to discuss the July 13 assassination attempt on former President Trump during a rally in Butler, Pennsylvania.

A new Senate report on this summer's assassination attempt against Donald Trump could be released as soon as next week. CBS News congressional correspondent Scott MacFarlane has more.