One spectator was killed and two were 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.
The alleged shooter was killed by snipers. One spectator was killed and two were hurt, officials said.
As the FBI investigation continues, questions are swirling about how a 20-year-old Pennsylvania man was able to ascend undetected to a roof near a Trump rally, gain a direct line of sight and fire several rounds at the former president. Read more here.
New video obtained exclusively by Pittsburgh ABC affiliate WTAE appears to show gunman Thomas Matthew Crooks pacing just beyond the boundaries of the Trump rally at 5:06 p.m. Saturday -- about 1 hour and 5 minutes before shots were first fired. Law enforcement sources said they believe this video shows Crooks.
House Homeland Security Committee Chairman Mark Green, R-Tenn., has invited several members of Pennsylvania state and local law enforcement to testify before the committee in the "coming days."
The invited law enforcement officers are: Pennsylvania State Police Commissioner Col. Christopher Paris, Butler County Sheriff Michael Slupe and Butler Township Police Lt. Matthew Pearson of the Butler Township Police Department.
The Secret Service requested a local police cruiser to be staged at the building where the shooter was perched when he attempted to assassinate former President Donald Trump, but local police were not able to provide one, according to two sources familiar with the situation.
The Secret Service was told before the rally that local police would not be able to stage the cruiser by the building, sources said.
The detail was first reported by the Washington Post.
-ABC News’ Luke Barr and Josh Margolin
Vice President Kamala Harris addressed Saturday’s shooting in Kalamazoo, Michigan, on Wednesday at her first campaign event since the assassination attempt.
"I do want to discuss briefly what happened on Saturday. Have not had a chance yet to publicly talk about it. But I will say a few words about the attempt on the life of former President Trump," Harris said.
"It was heinous, horrible and cowardly act. My husband, Doug, and I are thankful he's not seriously injured," Harris said. "As we saw what was happening, we said a prayer for his well-being and our thoughts immediately turned to Melania, who we have met, and their family. The bottom line is no one should have to fear for the safety of a loved one because they serve in public office."
"Our heart goes out to the family of Corey [Comperatore, the spectator who was shot and killed] -- a true hero who died protecting his family. And Doug and I, of course, are holding them close in our hearts," Harris said. "We are wishing those who were critically injured that day a swift and full recovery."
The two spectators shot and injured, 57-year-old David Dutch and 74-year-old James Copenhaver, remain hospitalized.
-ABC News’ Gabriella Abdul-Hakim
