A member of the U.S. Secret Service walks with a K-9 service dog on the north side of the White House along Pennsylvania Avenue in Washington, D.C., U.S., on Monday, Sept. 22, 2014. A security review prompted by an intruder entering the White House last week may include a fresh look at restrictions rejected in the past, including tourist checkpoints outside the grounds, a federal law enforcement official said. Photographer: Andrew Harrer/Bloomberg via Getty Images