He opened fire early Wednesday morning on a baseball field in Alexandria, Virginia.
The gunman was identified as James T Hodgkinson from IL. The force was expanded and formalized in 1828 after a series of incidents, including an assault on the son of President John Quincy Adams in the Capitol Rotunda.
Capitol Police Chief Matthew Verderosa said during a news conference Wednesday that the officers wounded are in good condition and had injuries not considered life-threatening.
The congressional baseball game between Republicans and Democrats scheduled for Thursday is "the last bipartisan thing that is celebrated here" in Washington, Fortenberry said. He said the FBI has joined the investigation.
Matt Mika - a lobbyist for Tyson Foods - was also among the injured.
The gunman, who was armed with a rifle, was shot before being taken into custody, lawmakers who saw the shooting told reporters. Brooks added that he used his belt as a tourniquet to help one of the victims. The female officer was one of the wounded, he said, and the male officer was returning fire.
Duncan, of SC, says he gave a description of the man to Alexandria police that "fits the picture that's being shown on TV".
"We had no defence at all".
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The South Carolina congressman said he told the man that the players are Republicans. "I just didn't want her to wake up and learn the news", Flake said.
"It was bedlam", Brooks said.
Meehan, who told reporters Scalise's security detail consists of two people and they usually sit in the stands on the first base side, said he had never felt unsafe there before.
House Majority Leader Kevin McCarthy said they drew the gunman's fire while most of the representatives took cover in a dugout, where they would have been easy targets.
The shooting occurred at a popular park and baseball complex in Alexandria, Virginia, where Republican lawmakers and others were gathered for a morning practice about 7 a.m.
Asked by a CNN host if the attack was deliberate, Mr Brooks replied: "Well, it sure as heck wasn't an accident! He was going after elected officials". "Our thoughts and prayers are with the members of Congress, their staffs, Capitol Police, first responders, and all others affected".
The gunman had a rifle and "a lot of ammo", said Sen.
The last time a lawmaker was shot was when Democratic Rep.
Giffords said in a statement: "This shooting is an attack on all who serve and on all who participate in our democracy".