Starting on July 6, the gunman, Thomas Matthew Crooks, became "very focused" on former President Donald Trump and the rally in Butler, Pennsylvania, FBI Director Christopher Wray told the House Judiciary Committee.

"On July 6, he did a Google search for, 'How far away was Oswald from Kennedy?'" Wray said.

The shooter went to the rally site a week before the assassination attempt and spent about 20 minutes there, Wray said.

"Then he went to grounds again on the morning of the event, it appears, for about 17 minutes," Wray said.

Crooks went to the site a third time "for good,” Wray said.

-ABC News’ Luke Barr

Authorities still "do not yet have a clear picture" of the Trump rally shooter's motive, FBI Director Christopher Wray told the House Judiciary Committee on Wednesday.

"The shooter appears to have done a lot of searches of public figures in general, but so far we’re seeing, kind of, news articles and things like that," he said.

"We’re doing a lot of work right now and some more to come on that," Wray added.

The shooter, Thomas Matthew Crooks, flew a drone about 200 yards from the rally venue, and had it up in the air for about 11 minutes, just hours before the shooting, FBI Director Christopher Wray told the House Judiciary Committee on Wednesday.

The drone -- which was recovered in the shooter’s car -- was flown at about 3:50 p.m., he said.

"Let me be clear about the area -- not over the stage, and that part of the area itself, but, I would say, about 200 yards, give or take, away," he said. "And that we think, but we do not know. So again, this is one of these things that's qualified because of our ongoing review."

Wray confirmed two explosive devices were recovered in Crooks’ car and one was recovered in his home.

Wray called them "relatively crude devices," but he added, "they did have the ability to be detonated remotely."

Crooks had a transmitter with him when he was killed by law enforcement.

5:15

FBI director's testimony reveals new details about Trump assassination attempt

FBI Director Christopher Wray revealed more details on the suspect leading up to and after the shooting, including use of a drone and explosives found in the suspect's car

Wray said that based on the positioning of the on and off switch on the devices, "if he had tried to detonate those devices from the roof, it would not have worked."

"But that doesn't mean the explosives weren't dangerous," he added.

-ABC News’ Luke Barr

Trump called U.S. Secret Service Director Kimberly Cheatle's resignation “inevitable" on Newsmax Tuesday evening.

He also slammed the Secret Service for not getting to the bottom of what had happened yet.

"I have to feel safe. Otherwise, I guess, I wouldn't be able to do this stuff," Trump said.

"Now, they have really beefed it up. They should have beefed it up before," he said. "I know that we've been asking for them to beef it up here."

-ABC News' Soorin Kim, Kelsey Walsh and Lalee Ibssa