Secret Service Director Julia Pierson testifies to the House Oversight and Government Reform Committee about the White House perimeter breach during a hearing in the Rayburn House Office Building September 30, 2014 in Washington, DC.

Secret Service Director Julia Pierson testifies to the House Oversight and Government Reform Committee about the White House perimeter breach during a hearing in the Rayburn House Office Building September 30, 2014 in Washington, DC.

*One day after she was grilled on Capitol Hill about a White House security breach, Secret Service Director Julia Pierson has resigned.

Homeland Security Secretary Jeh Johnson said she offered her resignation and he accepted it, reports the Associated Press.

Pierson, who has been with the agency for 30 years, will be replaced by Joseph Clancy, a former special agent in charge of the president’s protective detail who retired in 2011.

Pierson took command of the Secret Service last year in the wake of incidents involving misconduct by officers and agents, including the 2012 Colombia prostitution scandal.

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Rep. Jason Chaffetz, chairman of the House Oversight and Government Reform subcommittee on national security, which is probing the recent incidents, blasted the Secret Service during a hearing Tuesday for allowing a man, later found to be carrying a knife, to jump the White House fence and make it into the interior of the executive mansion before he was subdued.

The Washington Post reported hours after that hearing that the Secret Service was unaware that a man who rode an elevator with Obama in mid-September was a convicted felon and carrying a gun.

That was the final straw for Chaffetz, who noted two possible lethal mistakes in two days is unacceptable. He says he’s been investigating the Secret Service for more than a year and his findings are troubling.

“This is not just a reaction to one or two incidents,” Chaffetz said. “I’m convinced there is a systemic problem that won’t change under [Pierson’s] leadership.”