Former President Donald Trump's daughter Tiffany said that "political violence is never the answer," as she thanked members of the Secret Service and law enforcement for "fearlessly" intervening on Saturday.

"Please include the families of the victims in your prayers," she said on social platform X. "As you saw today, my father is a fighter and he will continue to fight for you and the USA."

The former president's eldest son, Donald Trump Jr., said in a separate statement on social media that the shooting should "get the same attention" as the attack on the Capitol on Jan. 6, 2021.

-ABC News' Oren Oppenheim and Kevin Shalvey

Thomas Matthew Crooks, the suspect in Saturday’s shooting, was registered as a Republican voter, according to Pennsylvania records.

-ABC News’ Charlotte Slovin

A Butler County resident whose house is one of the closest properties to the scene of the Trump rally shooting said she was surprised that the Secret Service did not search her home ahead of the event.

"I thought that would be something that they would do since I live so close," Carol Kerr, 82, told ABC News by phone early Sunday morning.

Kerr's house on Meridian Road is roughly a quarter of a mile from both the stage where the former president was speaking on Saturday and the location where the shooter is believed to have been firing from.

"I thought they would search the houses that are as close as mine is," Kerr said. "At least check them out and see if you have anything in your house which is dangerous, which I don't."

-ABC News' Jared Kofsky

The FBI early on Sunday identified the suspected gunman as Thomas Matthew Crooks, 20, of Bethel Park, Pennsylvania.

"This remains an active and ongoing investigation, and anyone with information that may assist with the investigation is encouraged to submit photos or videos online at FBI.gov/butler or call 1-800-CALL-FBI," an FBI spokesperson said.

-ABC News' Luke Barr and Jack Date