 would be his premier. A source tells CBS News the Secret Service was aware of a suspicious person with a rangefinder on the ground before the shooting, but did not stop him. President Biden is digging in his heels as he nurses a mild case of COVID amid mounting pressure from Democrats to drop his bid for reelection. Correspondent Ed O'Keefe. The two top congressional leaders, Hakeem Jeffries, Chuck Schumer, and Nancy Pelosi now have all said to him essentially,