U.S. Representative Steve Scalise, shot and wounded during a baseball practice last month, developed an infection and was readmitted to an intensive care unit

Republican lawmaker Steve Scalise, shot and wounded during a baseball practice last month, has been readmitted to ICU in a serious condition.

House Majority Whip Scalise, 51, from Louisiana, was one of five people shot while the Republicans' baseball team was practicing for the Congressional Baseball Game, a widely attended charity event, on June 14 in a Washington, D.C., suburb.

The representative had been improving in recent weeks following surgeries to repair internal organs and broken bones, and the hospital had even downgraded his condition to 'serious' from 'fair.'

But MedStar Washington Hospital Center officials report that Scalise has had to be readmitted to ICU after developing a serious infection.

The hospital said it would provide another update on Scalise, the No. 3 Republican leader in the House of Representatives, on Thursday.

A lobbyist for Tyson Foods, Matt Mika, a Capitol Hill staffer, Zack Barth, and two Capitol Police officers, David Bailey and Crystal Griner, were also wounded. All four are expected to make a full recovery.

Lawmakers who witnessed the shooting said there was several minutes that Scalise lay bleeding but was unable to get medical attention because of the active shooter situation.

He indicated he was able to get control of the external wound, but wasn't aware of whether there were internal injuries or internal blood loss. Rep. Mo Brooks described working with Wenstrup to use a belt to make a tourniquet to stop blood loss.

Scalise, who was shot in the hip, was rushed to hospital via helicopter in shock, with intense internal bleeding. His surgeon described how the bullet traversed his pelvis, shattering blood vessels, bones and internal organs along the way.

Scalise, 51, from Louisiana, was one of five people shot while the Republicans' baseball team was practicing for the Congressional Baseball Game

Members of the FBI and other law enforcement inspect the crime scene after a shooting during a practice of the Republican congressional baseball at Eugene Simpson Statium Park June 14

A tweet on the Congressman's official account on Saturday indicated he was feeling better: 'Steve is watching LSU baseball, rooting hard for a big Tigers win tonight!'

Dr. Jack Sava of MedStar Washington Hospital Center said there are hundreds of bullet fragments in Scalise's body, but 'we have no intention to try and remove all the bullet fragments at this point.'

Nonetheless, said Sava, 'we fully expect him to be able to walk' and 'hopefully run.'

Scalise was making good progress and his condition was recently downgraded from 'serious' from 'fair.'

Scalise's security detail and other police officers shot and killed the assailant, James Hodgkinson, 66, of Illinois, who had lashed out against President Donald Trump and other Republicans over social media.

Hodgkinson had opened fire from behind the third base dugout while the players were on the field. Senator Rand Paul, who was at the scene but was not injured, described it as a 'killing field', while Michigan Rep. Mike Bishop said the men were 'sitting ducks' for the gunman and his M4 rifle.

Moments before the attack, a man - thought to be the shooter - asked if the group were Republicans or Democrats, Florida Rep. Ron DeSantis said. North Carolina Rep. Mike Walker told NBC News the 'gunman was there to kill as many Republican members as possible.'

Bishop described how one of the cops stood his ground to return fire as the congressmen and at least one of their children dove for cover in a dugout and Scalise dragged himself across the field after being hit, leaving a trail of blood behind him.

'As we were standing here this morning, a gunman walked up to the fence line and just began to shoot. I was standing at home plate and he was in the third base line,' he told CBS Detroit. 'He had a rifle that was clearly meant for the job of taking people out, multiple casualties, and he had several rounds and magazines that he kept unloading and reloading.'

Hodgkinson also had with him a piece of paper with doodles and the names of three lawmakers, according to a person familiar with the case.

The list of names reportedly included Alabama Rep Mo Brooks, South Carolina Rep Jeff Duncan and Arizona Rep Trent Franks.

The person told The Associated Press investigators aren't sure of the significance of the names and don't know if it was a list of people he was targeting. This person was not authorized to speak publicly about the case and spoke on condition of anonymity.