 Today, the House Oversight Committee will grill the Secret Service looking to find out why they left a building unguarded, which provided the perfect rooftop perch for the gunman who shot Donald Trump. There's multiple things that was done wrong here and incorrectly. GOP Congressman Corey Mills. President Biden has also ordered an independent review of security at the rally. We do not know the motive of the shooter yet. We don't know his opinions or affiliations.