Scalise, meanwhile, is in critical condition after being badly wounded and undergoing surgery.
When the gunfire popped in the northern Virginia baseball diamond Wednesday morning, Senator Jeff Flake took cover in the first base dugout as he watched a congressional colleague bleeding in the field.
Mika's family described him as "a very thoughtful, fun-loving person who is competitive and loyal; all things which contributed to his continued commitment to the Congressional Baseball Game".
The gunman, identified as James Hodgkinson III, a 66-year-old white male from IL, opened a barrage of gunfire at a congressional baseball practice field in Alexandria, Virginia.
Mr Trump said in a statement from the White House that Hodgkinson had died from injuries he received during the shooting. "He is grateful for the fearless actions of U.S. Capitol Police, first responders, and colleagues", the statement said.
Sanders said Hodgkinson volunteered on his presidential campaign and denounced the shooter's actions. Scalise - the House Republican Whip - was traveling with a small security detail.
Brooks said the gunman was armed with a rifle and appeared to be a white male, "a little bit on the chubby side".
"Congressman Scalise is a friend, and a very good friend", he said.
President Trump makes hospital visit after congressional baseball shooting
KOB reached out to the National Rifle Association, and they replied these gun control proposals are intrusive and ineffective. All we would have had would have been baseball bats versus a rifle. "Those aren't good odds", Brooks said.
Police say the suspect is in custody.
Democrats were also practising on another field at a different location, reported CNN. Without the Capitol Police Officers' bravery this morning, the results may have been different.
Special agents with Capitol Police, David Bailey and Krystal Griner were also among those injured.
"I condemn this appalling act of violence committed by a disturbed individual". Finally, as soon as someone said the shooter was down, I ran out to Steve and put pressure on the wound.
"Authorities are continuing to investigate the crime", said Trump, calling for unity after the shooting.
It happened during a Republican practice for the Annual Congressional Baseball Game held for charity.
In the statement, he also said, "My thoughts and prayers are with those that were wounded in this morning's awful attack". The game between congressional Democrats and congressional Republicans is a tradition in Washington that dates back almost a century.
Capitol Police also provide security for members who have received specific threats.
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