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The Department of Homeland Security's inspector general says it is investigating the US Secret Service's handling of security for former President Donald Trump on the day a gunman tried to assassinate him at a Pennsylvania rally.
The agency said in a brief notice on its website on Wednesday the objective was to evaluate the Secret Service's "process for securing former President Trump's July 13, 2024 campaign event".
There was no date given for when the investigation was launched. The notice was among a long list of ongoing cases that the inspector general's office is pursuing.
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The shooting has raised questions about how the gunman was able to climb onto a roof with a clear line of site to the former president, who was injured.
President Joe Biden already had directed an independent review of the security at the rally.
The 20-year-old shooter, Thomas Matthew Crooks, was able to get within 135 metres of the stage where the Republican former president was speaking when he opened fire.
That's despite a threat on Trump's life from Iran leading to additional security for the former president in the days before the Saturday rally.
A bloodied Trump was quickly escorted off the stage by Secret Service agents, and agency snipers killed the shooter.
Trump said the upper part of his right ear was pierced in the shooting. One rallygoer was killed, and two others critically wounded.
Secret Service director Kim Cheatle said the agency understood the importance of the review ordered by Biden and would fully participate in it as well as with congressional committees looking into the shooting.
She said the agency was working to understand how Saturday's shooting happened and to make sure something like it never does again.
The agency of roughly 7800 staff members is responsible for protecting presidents, vice presidents, their families, former presidents, their spouses and their children under the age of 16 and a few other high-level Cabinet officials such as the Homeland Security secretary.
