Who was present during the GOP congressional baseball team practice shooting in Virginia

— -- At least 20 Republican members of Congress were at this morning's baseball practice in Alexandria, Virginia, when a gunman began firing, injuring House Majority Whip Steve Scalise, R-La., and at least four other people.

The GOP lawmakers who make up the 34-member team were practicing for Thursday's annual charity congressional baseball game.

Zach Barth, a staffer for Rep. Roger Williams, was also injured. Barth is "receiving medical attention but is doing well and is expected to make a full recovery," according to Williams.

Also among the injured is Matt Mika, the director of government relations for Tyson Foods' Washington, D.C., office.

"He has been taken to a local hospital, and we're awaiting word on his condition. Matt has worked for Tyson Foods for more than six years, and we're deeply concerned about him and his family," a Tyson spokesperson said in a statement.

Rep. Brad Wenstrup of Ohio treated Scalise immediately after he was shot. Wenstrup has a medical degree and served in Iraq as a combat surgeon.

"I felt I was back in Iraq but without my weapon," Wenstrup told Fox News.

Here is the full list of attendees at the routine early-morning baseball practice that turned into a terrifying, chaotic scene:

Present during the shooting

• House Majority Whip Steve Scalise
• Capitol Police officer
• Capitol Police officer
• Rep. Roger Williams
• Williams' staffer Zach Barth
• Rep. Joe Barton
• Barton's chief of staff, Ryan Thompson
• Barton's sons, Jack and Brad
• Rep. Steve Pearce
• Rep. Mo Brooks
• Sen. Rand Paul
• Rep. Brad Wenstrup
• Rep. Ron DeSantis
• Sen. Jeff Flake
• Rep. Chuck Fleischmann
• Rep. Barry Loudermilk
• Rep. Jeff Duncan
• Rep. Trent Kelly
• Rep. John Moolenaar
• Rep. Gary Palmer
• Rep. Mike Bishop
• Rep. Jack Bergman
• Rep. Mike Conaway
• Rep. Rodney Davis
• Matt Mika

Practiced but left before the shooting

• Rep. Tom Rooney
• Rep. Mark Walker
• Rep. Bill Johnson

Team members not present at the time of the shooting

• Rep. Matt Gaetz
• Rep. Roger Marshall
• Rep. Kevin Yoder
• Rep. Dennis Ross
• Rep. Ryan Costello
• Rep. Pat Meehan
• Rep. Doug LaMalfa
• Rep. Darren LaHood
• Rep. Steven Palazzo
• Rep. Kevin Brady
• Rep. Erik Paulsen
• Rep. John Shimkus

ABC News' Cindy Smith, Benjamin Siegel, Ali Rogin, MaryAlice Parks, Jordyn Phelps, John Parkinson, Angie Yack, Arlette Saenz, Zunaira Zaki and Michael Del Moro contributed to this report.