In the week since the assassination attempt on Donald Trump, the security mistakes that led to the shooting have come into sharp focus, prompting Kimberly Cheatle, the head of the Secret Service, to resign.

Glenn Thrush, who reports on the Justice Department for The Times, discusses what we now know about the service’s lapses that day.

Guest: Glenn Thrush, a reporter on the Justice Department for The New York Times.

Background reading:

• See a visual timeline of the shooting at the Trump rally.
• In resigning, Ms. Cheatle said that one of the Secret Service’s foremost duties was to protect the nation’s leaders, adding that it “fell short of that mission” on July 13.

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