He said that Scalise has been mostly sedated but they've been able to turn down his medication enough for him to respond to family members.
Dr. Jack Sava of MedStar Washington Hospital Center says "an excellent recovery is a good possibility", but says Scalise faces additional surgeries, a long hospital stay and rehabilitation.
Brett Horton, Scalise's chief of staff, read a statement from Scalise's wife today, thanking everyone "for the incredible amount of prayers and warm wishes we've received since Wednesday's events".
Sava says infection remains a risk, after doctors performed several surgeries to stop bleeding and begin repairing abdominal and bone damage. His family said in a statement he was showing "positive results" and was expected to make a full recovery. "It's been - he's in some trouble, but he's a great fighter and he's going to be okay, we hope", said President Donald Trump at a Thursday news conference.
Griner, who was also shot, is in the hospital in good condition and spirits after a gunshot wound to the ankle, Sava said today.
Trump also adds, as he's said previously, that Scalise is "having a hard time, far worse than anybody thought" following the shooting Wednesday.
A shooter, killed by return fire from officers, sprayed rifle fire at congressional Republicans practicing on a diamond in Alexandria, Virginia, a Washington suburb.
Trump's comments came at the beginning of his speech in Miami Friday announcing a partial rollback of ties to Cuba - reversing changes made by President Barack Obama's administration.
Reports indicate that President Trump interrupted his agenda to visit the hospital after the tragic shooting of Rep. Steve Sacalise on Wednesday.
Scalise sustained serious injuries as the bullet traveled through his pelvis and injured internal organs.
Members of Congress took the field at Washington's Nationals Park on Thursday night for the charity baseball game, many wearing hats to honour Mr Scalise, who has represented Louisiana in the House since 2008.
Scalise, Tyson Foods lobbyist Matt Mika, congressional aide Zach Barth and US Capitol Police officer Crystal Griner were shot during an attack on the Republican congressional baseball team as it practiced Wednesday morning.