Very few people know about one of the most serious security failures in modern American history—when a man entered the White House armed with a knife during Barack Obama’s presidency. In 2014, Omar J. Gonzalez, an Iraq war veteran suffering from PTSD, jumped the fence along Pennsylvania Avenue and reached the North Lawn of the White House. After clearing the fence, he sprinted across the lawn, colliding with Secret Service guards and canine units. What shocked the nation was what happened next.