Homeland Security Secretary Markwayne Mullin on Friday defended the Secret Service’s response to Saturday’s shooting at the White House Correspondents’ Association (WHCA) dinner, saying agents “performed their job” by preventing the gunman from breaching the second security perimeter.

“The security perimeter worked exactly like it was supposed to work, but that’s why we have layers of security built in,” Mullin told Fox News host Dana Perino on “ America’s Newsroom .”

“The first layer was breached. The gentleman never — I say the gentleman — the perp never penetrated the second one,” he continued.…