Federal investigators have tentatively identified the man who shot at Trump today in Pennsylvania: He is about 20 and is from Pennsylvania, according to five senior U.S. law enforcement officials briefed on the matter.

Pennsylvania Gov. Josh Shapiro said on X that Trump left the Butler area "under the protection of US Secret Service and with the assistance of the Pennsylvania State Police."

House Oversight Commitee Chairman James Comer has formally asked Secret Service Director Kimberly Cheatle to appear for a hearing on July 22, according to a letter the committee posted to X.

"The tremendous bravery of the individual United States Secret Service agents who protected President Trump, eliminated the gunman, and possibly averted more loss of life cannot be overstated," Comer, R-Ky., wrote in a letter to Cheatle.

The committee requested Cheatle's "voluntary appearance" as part of its investigation.

A video appears to show the body of a possible shooter on the roof of a building near where people were gathered for Trump’s rally.

Four sources told NBC News' Tom Winter that the video was confirmed as being from the scene of the shooting. Multiple law enforcement officials told NBC News that the person believed to be the shooter was male and is dead.

The supposed shooter's identity has not yet been confirmed.

Concerns about the rising prevalence of violent threats and a growing list of violent attacks on politicians were punctuated on Saturday when a gunman killed at least one person in an assassination attempt on Trump.

The shooting immediately sparked concerns that the already-heated election cycle would lead to more violence.

Read the full story here.

A Trump supporter in Milwaukee ahead of next week's Republican National Convention demanded that Americans "get hate out of our vocabulary" but predicted the shooting wouldn't deter Trump's candidacy.

"Love the ones who vote differently than you," Kentucky voter Angie Prowell told NBC News outside Fiserv Forum in Milwaukee, where the GOP convention will be held. "We’ve got to get hate out of our vocabulary, out of our everyday way of life."

Despite the mayhem of Saturday's violence, Prowell said she's as confident as ever in Trump's campaign.

"That man will rise up stronger," said Prowell. "They missed. Unfortunately, they hit someone else. So he will be fine. He will be strong. Security will have to be stronger, but … they missed."

Trump was injured, a spectator was killed and two others were critically injured when someone opened fire at a Trump rally in Pennsylvania, authorities said.

Trump said on his social media platform, Truth Social, that he was shot in his right ear.

Biden said the nation must unite in condemning such political violence. He said every pertinent federal agency was being scrambled to respond and investigate.

The shooting started shortly after Trump took his position at the podium onstage.

Read the full story here.

Speaker Mike Johnson, R-La., said the House will investigate the shooting at Trump’s rally, which Oversight Committee Chair James Comer, R-Ky., earlier said his committee would do.

Biden spoke with Trump, a White House official said.

The president also spoke with Pennsylvania Gov. Josh Shapiro and Butler Mayor Bob Dandoy, the official added. 

Biden is scheduled to return to Washington tonight and he is expected to get an updated briefing from the Department of Homeland Security and law enforcement officials tomorrow.