Donald Trump makes statement following his assassination attempt.

A shooting at Donald Trump ’s rally in Butler, Pennsylvania is being investigated as an attempted assassination of the former president and presumptive Republican nominee, law enforcement officials say.

Trump called Sunday for unity and resilience as shocked leaders across the political divide reacted to the shooting.

The Secret Service said it killed the suspected shooter, who attacked from an elevated position outside the rally venue.

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President Joe Biden had planned to speak in Texas on the 60th anniversary of the Civil Rights Act at the Lyndon B. Johnson presidential library, the White House said.

Randy Reamer, president of the Buffalo Township volunteer fire company, called Corey Comperatore “a stand-up guy” and “a true brother of the fire service.”

He said Comperatore served as chief of the company for about three years but was also a life member, meaning he’d served for more than 20 years.

“Just a great all-around guy, always willing to help someone out,” Reamer said of Comperatore, who’s survived by his wife and two daughters. “He definitely stood up for what he believed in, never backed down to anyone. … He was a really good guy.”

Attorney General Merrick Garland, who was scheduled to travel this week, will stay in Washington to closely monitor the investigation into the shooting at a Trump rally, a Justice Department spokesperson said.

Garland continues to receive regular briefings on the shooting and met Sunday morning with officials across the government, the spokesperson said.

U.S. Rep. Mark E. Green, the chairman of the House homeland security committee, sent a letter to Homeland Security Secretary Alejandro Mayorkas on Sunday raising questions about the Trump rally shooting and demanding information about the former president’s Secret Service protection.