Trump Jr. says father is 'changed man'

The U.S. Secret Service is investigating how a gunman armed with an AR-style rifle was able to get close enough to shoot and injure former President Donald Trump at a rally Saturday in Pennsylvania, a monumental failure of one of the agency's core duties.

The gunman, who was killed by Secret Service personnel, fired multiple shots at the stage from an "elevated position outside of the rally venue," the agency said.

READ MORE | The Secret Service is investigating how a gunman who shot and injured Trump was able to get so close

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.

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.

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.