President Obama is supporting the Secret Service in the wake of a deeply troubling incident in which a disturbed man jumped the White House fence, sprinted across the North Lawn, and actually entered the White House Friday evening.

The man, 42 year-old Omar Gonzalez, had a folding knife in his pocket and had left 800 rounds of ammunition in his car not far from the White House. Gonzalez had also drawn the attention of authorities at least twice a few weeks ago — once in Virginia, when he was found with a sniper rifle, a sawed-off shotgun, and a map with the White House circled on it, and a second time when he walked near the White House fence with a hatchet in his waistband.