Wenstrup ran onto the field to assist Scalise, Alabama Rep. Mo Brooks told CNN.
"I held a cloth over the wound to stop the bleeding as Brad was getting some kind of scissors device to cut through the pants to try to have better access to Steve Scalise's wound and his hip," Brooks told CNN. "I put pressure on his wound in his hip."
Scalise was conscious while Wenstrup was treating him, Wenstrup told ABC News.
“I was testing him, ‘Steve count to five,’ things like that to make sure,” Wenstrup said.
Wenstrup said the shooter was "well equipped" and had "lots of ammunition."
"It seems like today, anything can happen," he said.
Susan Brisbin worked with Wenstrup when he practiced medicine at Wellington Orthopedic in Blue Ash. Brisbin said Wenstrup’s actions mirror his character.
“(It was) so expected, and always know that’s what he would do,” Brisbin said. “He's just that kind of a person," Brisbin said.
Dr. Robert Hidt, CEO of Wellington Orthopedic, said he talked to Wenstrup after the shooting.
Hidt said Wenstrup saw that Scalise had been shot in the hip, and he took off his belt and made a tourniquet to stop the bleeding.
“Thankfully Brad was there to to stop the bleeding, to control that, so in many ways I think he saved him from what could’ve happened,” Hidt said.
Hidt said Wenstrup ran out to Scalise despite warnings from police.
“Brad reacts in a positive way, always wants to help people,” Hidt said. “We’re very lucky to have him here in Cincinnati as our congressman.”
Sen. Rand Paul spoke to Good Morning America describing the scene. He said he heard 50 or 60 shots fired at the scene.