James Clancy, the tarnished protection agency's new boss, was in the hot seat over an incident early this month in which two senior agents drove into White House barricades after a night of boozing but were not detained or given breathalyzer tests.
Lawmakers expressed displeasure over Clancy's acknowledgement to the House Appropriations Committee panel that he did not learn of the March 4 incident until five days later.
"I should have been informed" immediately, he said."We're following up on that, and there will be accountability."
The incident marked the latest of several embarrassments for the agency, including a major security breach last September when an intruder barged into the White House wielding a knife.
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Lawmakers also appeared flabbergasted at Clancy's suggestion that changing Secret Service "culture" would take time, as he seeks to earn agents' trust as their new director.
"They're supposed to earn your trust and they haven't earned your trust. And the way you earn their trust is you hold them accountable."
A humbled Clancy repeatedly said "Yes, sir" and "Yes, ma'am" when confronted with withering congressional critiques, which only grew when he said agents were coping with job demands by drinking.
"There's an element within our agency that does cope with stresses... By using alcohol," Clancy said, noting that the agency recently launched an initiative to address stress.
"We've got to find a way to help some of these people that are going toward alcohol as a coping mechanism," he said.