WASHINGTON — Lawmakers from both parties on Tuesday assailed Julia Pierson, the director of the Secret Service, about security breaches at the White House, including an intruder who earlier this month breached multiple security measures and evaded capture as he ran around the first floor of the mansion.

Ms. Pierson said in opening statements before the House Committee on Oversight and Government Reform that she took full responsibility for the breaches and she pledged that “what happened is unacceptable and it will never happen again.” But her promise of a comprehensive review of the incidents appeared to do little to satisfy members of the committee.

Representative Stephen F. Lynch, Democrat of Massachusetts, lashed into Ms. Pierson, saying that he did not believe the Secret Service takes seriously its duty to protect the president. He said he had “very low confidence” in her leadership.

“I wish to God that you protected the White House like you’re protecting your reputation right now,” Mr. Lynch said.

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