 Congress already investigating the shooting of Donald Trump over the weekend. Today, the House Oversight Committee will grill the Secret Service looking to find out why they left a building unguarded. A building that provided the perfect rooftop perch for the gunman who shot the former president. There's multiple things that was done wrong here and incorrectly. Republican Congressman Corey Mills. President Biden has also ordered an independent review of security at the rally. Do not know the motive of the shooter yet.