WASHINGTON (AP) — The acting director of the Secret Service was incensed at what had happened that July evening. “What I saw made me ashamed,†Ronald Rowe Jr. said. “I cannot defend why that roof was not better secured.â€

The unguarded roof, easily within shooting distance of the rally stage, is just one of the myriad questions behind the worst Secret Service security failure in decades. The more that investigators unpack from that day, the more missed opportunities that could have prevented the attack are revealed.

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