It has been forty three years since the last assassination attempt on a former or present US president, when Ronald Reagan was shot in the lung but survived.
Today, American politicians and the public want to know how a would-be assassin was able to crawl onto a rooftop vantage point, armed with a rifle, and let off four shots towards the podium, all in an area that was supposed to have been cleared.
The investigation that is already under way involves the FBI as well as the Secret Service and the Department of Homeland Security.
The Secret Service director, Kimberly Cheatle, has been summoned to testify before a committee of the US House of Representatives on 22 July.
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