Scalise and the others had been at the GOP team's baseball practice in nearby Alexandria, Virginia, when they were shot.
The assailant, 66-year-old James T. Hodgkinson, had nursed grievances against President Trump and the GOP.
"We may have our differences, but we do well in times like these to remember that everyone who serves in our nation's capital is here because, above all, they love our country", he said.
Trump says Scalise "continues his very courageous fight", but adds: "it has been much more hard than people even thought at the time". Then, Wednesday, an IL man showed up at the GOP practice and fired dozens of bullets, hitting representatives, staffers and Capitol Police officers before he was shot and killed.
Speaking from the White House, Trump called the Louisiana congressman a "greater fighter" but indicated the situation remains very serious.
"There are no D's and R's behind our names today", Rep. Joe Crowley, a Democrat from NY, said.More news: Comey boosted case for obstruction charges against Trump: legal experts
He said he saw the shooter with a long gun near the third base dugout taking "deliberate aim" at people on the field. He called for replacing "the attacks of hateful personal politics and resistance" with respect. "An attack on one of us is an attack on all of us", House Speaker Paul Ryan tweeted.
Bernie Sanders (I-Vt.) presidential campaign volunteer who frequently posted anti-Trump material on Facebook. Sanders said he denounced the violence "in the strongest possible terms".
Two U.S. Capitol police officers who were wounded are in "good condition", Capitol Police Chief Matthew Verderosa said.
The congressional staffer wounded in the shooting at a congressional baseball practice Wednesday morning near Washington, D.C., is out of the hospital and recounting his harrowing experience.
The charity ballgame between a Republican team and a Democratic team will go ahead as scheduled on Thursday at Nationals Park, home of the Washington Nationals Major League Baseball team. Members said Nationals Park was designed as a secure facility. Many praised the message of unity, and the appreciation the entire congressional community feels for the Capitol Police. "If we had that debate, it'd end like it always ends", Mr Graham said. He dragged himself away from the infield leaving a trail of blood before fellow lawmakers could rush to his assistance.
According to state lawmakers, word spread quickly in Columbus when news first broke of the shooting Wednesday morning.More news: Steve Scalise undergoes third surgery since shooting
"The guy's down to a handgun, he dropped his rifle, they shoot him, I go over there, they put him in handcuffs", Conaway said, adding that if the shooter had "gotten inside the fence, where a bunch of guys were holed up in the dugout, it would have been like shooting fish in a barrel".
Hodgkinson, who was armed with a handgun and a rifle, died from multiple gunshot wounds to his torso, the Federal Bureau of Investigation said. Jeff Flake and Rep. Brad Wenstrup, who is a physician, applied pressure to his wound, Flake said.
Scalise was one of four people shot.
Williams suffered a sprained ankle as he took cover.
He told CBS his sons Jack and Brad also were at the field throughout the incident and that they were "very brave" in seeking shelter. "He could talk. I asked him to count to 5 and he did".
The event raised questions about the security of members of Congress. Scalise was hit. Luckily no one appeared to be killed. The Democratic Whip Steny Hoyer's staff delivered pizza to Scalise's office in the late afternoon. "The thoughts and prayers of the entire LSU community are with Rep. Scalise, his family and all of those injured".More news: Jury questions posed during Bill Cosby's sex assault trial
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