WASHINGTON — U.S. Secret Service Mark Sullivan arrived at a Congressional hearing on Thursday to not only deliver a mea culpa for the lapse in security at the White House during a state dinner, but to announce that three uniformed U.S. Secret Service officers have been put on leave.

“Established protocols and procedures were not followed,” Sullivan said, adding  “In our line of work we cannot afford even one mistake.”

httpv://www.youtube.com/watch?v=EyLTtqPUXQg

Visit msnbc.com for breaking news, world news, and news about the economy