U.S. Secret Service: We failed during the Trump assassination.

The director of the U.S. Secret Service said the assassination against former President Donald Trump was the agency's “biggest operational failure” in decades.

Director Kimberly Chetle told American lawmakers during a hearing session in Congress on Monday that “13 July we failed”.

Chetle said she takes full responsibility for the agency's mistakes regarding the attack at the Trump rally held in Pennsylvania on 13 July.

Chetle is witnessing before a committee of Congress, as calls are increasing for her to resign due to security failures at the rally, where a 20-year-old armed attempted to kill the former Republican president.

The House of Representatives' Commission for Monitoring heard the first Cheatle testimony since the shooting at the July 13th rally in Pennsylvania that killed a person in the audience.

Trump was injured in the ear, and two more people were injured after Thomas Matthew Crooks climbed to the roof of a nearby building and opened fire.

The Secret Service director said the agency has rejected the request for security increase for the 13 July rally.

We have not denied any assets for the events of July 13th”, she said before Congress.

“We believe there were sufficient numbers of agents” at the Trump rally on 13 July, she said.

American lawmakers have expressed outrage at how the gunman could have approached so many Republican candidates for president, when he was supposed to be carefully guarded. The Secret Service has acknowledged that it has denied several requests from Trump's campaign for increased security in events he has participated in years before the assassination. /rel