Crime scene investigators search for evidence at the scene of a multiple shooting in Alexandria, Va., on Wednesday, where House Majority Whip Steve Scalise of Louisiana and others were shot during a congressional baseball practice.

Capitol Hill Police Officer Nathan Rainey stands guard on Capitol Hill in Washington on Wednesday after House Majority Whip Steve Scalise of Louisiana and others were shot during a congressional baseball practice in Alexandria, Va.

House Majority Whip Steve Scalise speaks with reporters on May 17 on Capitol Hill in Washington. Scalise was one of several people injured when a gunman opened fire Wednesday at a congressional baseball practice.

President Trump and first lady Melania Trump talk with Dr. Ira Rabin on Wednesday night after visiting MedStar Washington Hospital Center, where U.S. Rep. Steve Scalise of Louisiana had surgery after being shot in Alexandria, Va., during a congressional baseball practice.

Investigators confer before looking for evidence around the baseball field in Alexandria, Va., on Wednesday, that was the scene of a shooting involving House Majority Whip Steve Scalise of Louisians and others, during congressional baseball practice.

A Capitol Hill Police officer stands at his post at the entrance to the House of Representatives on Capitol Hill in Washington on Wednesday after House Majority Whip Steve Scalise of Louisiana and others were injured in a shooting during a congressional baseball practice in Alexandria, Va.

House Speaker Paul Ryan of Wisconsin, right, and House Majority Leader Kevin McCarthy of California, walk to a security briefing for lawmakers on Capitol Hill in Washington on Wednesday after a gunman opened fire at a congressional baseball practice in Alexandria, Virginia.

Sen. Bernie Sanders, I-Vt., pauses as he speaks Wednesday on the Senate floor at the Capitol in Washington, about the shooting at the Republican congressional baseball practice. Sanders says the man authorities identified as opening fire on the practice had apparently volunteered on his presidential campaign. Sanders said in a statement: "I am sickened by this despicable act."

Police and other first responders block East Monroe Ave. in Alexandria, Virginia, Wednesday after a shooting at a congressional baseball practice.

Members of law enforcement talk outside the home of James T. Hodgkinson on Wednesday in Belleville, Ill. Officials said Hodgkinson has been identified as the man who opened fire on Republican lawmakers at a congressional baseball practice Wednesday morning in Alexandria, Va.

Alexandria Police Chief Michael Brown, right, and others walk toward the media to speak about Wednesday's shooting.

Rep. Mo Brooks of Alabama meets with reporters after the shooting. Several people were also believed to have been hit, according to a lawmaker who witnessed the shooting.

Police and emergency personnel are gathered near the field where House Majority Whip Steve Scalise was shot during a Congressional baseball practice in Alexandria, Virginia, on Wednesday.

Rep. Jack Bergman of Michigan talks on the phone while walking past a damaged vehicle at the scene of the shooting.

A Capitol Hill Police officer stands his post at the entrance to the House of Representatives Wednesday on Capitol Hill in Washington.

Rep. Joe Barton, R-Texas, manager of the Republican baseball team, still wearing his uniform and with his son, who is visible at rear left, speaks to reporters on Capitol Hill in Washington on Wednesday about the shooting of House Majority Whip Steve Scalise of Louisiana and others.

Tourists are directed away from the Capitol Building and across the lawn by Capitol Hill Police officers after the shooting at a baseball practice in Alexandria, Virginia.