One spectator was killed and two were critically hurt in Saturday's shooting.
Federal authorities are investigating after former President Donald Trump was shot in the ear in an assassination attempt at an election rally in Butler, Pennsylvania, on Saturday.
Blood splattered on Trump's face as Secret Service agents surrounded him and led him off the stage to a waiting vehicle to whisk him away. Trump is "fine," a spokesperson said.
The alleged shooter was killed by snipers. Corey Comperatore, a firefighter and a father of two daughters, died in the shooting Pennsylvania Gov. Josh Shapiro said. Two other people who attended the rally were also injured.
Former President Donald Trump said he will head to Milwaukee for the Republican National Convention on Sunday afternoon.
Trump wrote on social media that he was going to delay the trip by two days, "but have just decided that I cannot allow a 'shooter,' or potential assassin, to force change to scheduling, or anything else."
President Joe Biden said he had a "short but good conversation" with former President Donald Trump on Saturday night in the wake of the shooting.
"I am sincerely grateful that he's doing well and recovering," Biden said in an address to the nation on Sunday.
No motive is known, Biden said, and he urged the public to not make assumptions.
Biden said he's directed the head of the Secret Service to review all security measures for the Republican National Convention, which begins on Monday in Milwaukee.
"We'll share the results of that independent review with the American people," Biden said.
He added, "I've been consistent in my direction of the Secret Service to provide [Trump] with every resource, capability and protective measure necessary to ensure his continued safety."
Biden said he will speak from the Oval Office at 8 p.m. ET on Sunday.
President Joe Biden is rescheduling his Monday trip to Austin, Texas, where he was scheduled to deliver the keynote address at a commemoration for the 60th anniversary of the Civil Rights Act, according to the White House.
This is Biden's first rescheduled event in the wake of the assassination attempt on former President Donald Trump. It also follows Vice President Kamala Harris postponing her Tuesday campaign stop in Florida.
Biden is expected to deliver remarks to the nation at 1:30 p.m. ET Sunday.
Former classmates of the suspected shooter, 20-year-old Thomas Matthew Crooks, of Bethel Park, Pennsylvania, described him to ABC News as a student who was "quiet" and did not have many friends.
"He was somebody who came across as lonely a lot," said Jameson Myers, who said he attended both elementary and high school with Crooks.
Myers described him as "more socially reserved" and someone who "didn't have a ton of friends."
MORE | What we know about the Trump rally shooting suspect
But he said he never heard Crooks discuss politics or, specifically, Donald Trump.
"I was friends with him. He never acted, like, by any means, a political revolutionary," Myers said. "Was a very nice, even sweet guy, from what I knew."
Another classmate, Zoe Materkowski, said he was "just a quiet kid."
Added Jason Kohler, a classmate: "He was a loner. He would sit alone at lunch."
Classmate Robert Abraham described him as "smart" and "kind."
