At a campaign rally in Butler, PA, former President Trump narrowly escaped a potentially fatal shooting due to a series of shocking failures by the Secret Service. Despite having advanced technology at their disposal, miscommunication and equipment malfunctions left agents unaware of a gunman on a nearby rooftop. The Secret Service missed crucial chances to detect and stop the threat, including turning down a local drone offer and failing to boost communication signals. The tragic incident, where one attendee died and Trump was injured, highlighted the agency's alarming struggle to effectively use modern technology, leading to one of its biggest security lapses in decades.

After a week of mistakes, the officers protecting former President Donald J. Trump at a campaign rally in Butler, Pennsylvania, had one last chance to do their job right. That chance lasted about 30 seconds.

It started when a local police officer looked over the roof of a warehouse near the rally and spott...