Former President Donald Trump underwent a precautionary CT scan after he was shot on the upper ear during his campaign event Saturday, sources told ABC News.

The scan came back clear, sources said.

Trump is in Milwaukee Sunday ahead of the Republican National Convention that begins Monday.

-ABC News' Aaron Katersky

Rep. Ronny Jackson of Texas, who says his nephew was injured while in the crowd during Trump’s Saturday rally, told ABC News Trump is "completely unfazed" by the assassination attempt.

"He's normal Trump," Jackson said in Milwaukee Sunday night, adding that the former president is "really motivated and fired up" after the shooting.

Jackson also said Trump was feeling good about being in Milwaukee for the Republican National Convention.

"He could have not come today based on what happened yesterday, but he wants to make sure that we stick to the schedule. He committed to some stuff today, and he's here," he said.

The man suspected of taking aim at former President Donald Trump Saturday night was a member of a local shooting club, counsel for the club confirms to ABC News.

Thomas Crooks belonged to Clairton Sportsmen's Club, in Clairton, Pennsylvania, roughly 12 miles south of Pittsburgh, which has a variety of shooting ranges.

"I can confirm that Mr. Crooks was a member of Clairton Sportsmen's Club," Robert S. Bootay III, attorney for the club, said in a statement.

"Beyond that, the Club is unable to make any additional commentary in relation to this matter in light of pending law enforcement investigations," Bootay continued.

"Obviously, the Club fully admonishes the senseless act of violence that occurred yesterday. The Club also offers its sincerest condolences to the Comperatore family and extends prayers to all of those injured including the former President," he said.

-ABC News' Sasha Pezenik

President Joe Biden spoke directly to the nation Sunday, saying the political landscape cannot be a "killing field" after the assassination attempt against former President Donald Trump Saturday.

"Disagreement is inevitable in American democracy," Biden said, adding, "It’s part of human nature."

"But politics must never be a literal battlefield or God forbid, a killing field," Biden continued.

"I believe politics ought to be an arena for peaceful debate, to pursue justice, to make decisions guided by the Declaration of Independence and our constitution we stand for in America, not of extremism and fury, but of decency and grace," Biden added.

During his address, Biden said that he spoke on the phone with Trump following the attack and that he's "grateful" Trump was not seriously injured and doing well.

Biden ended his speech with a call for unity, saying, "Let's remember we are the United States of America."

"There is nothing, nothing, nothing beyond our capacity when we do it together," he added.