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. “And so the Secret Service, even though they were shut down, still performed their job and did it in a remarkable and brave way.” Cole Allen, 31, is accused of opening fire at the Washington Hilton hotel, where senior Trump administration officials, including President Trump and Mullin, were gathered for the annual black-tie dinner with journalists.…