Former Secret Service agent on what security breakdowns could have led to attempted assassination of Trump

The transcript discusses an incident involving a bullet getting close to a former president and a supporter losing their life at a rally. House Oversight chairman James Comer calls for the Secret Service to testify. Melanie Burkholder, a former Secret Service agent, provides her insights on the assassination attempt, drawing from her experience during President George W. Bush's administration.

What was the context of the rally mentioned in the text?

How does Melanie Burkholder describe her experience with the Secret Service?