During the Trump rally in Butler, Pennsylvania, on Saturday, a local law enforcement officer reportedly spotted the would-be assassin and reported him to state police 30 minutes before the gunman opened fire on former President Donald Trump.

A law enforcement source, according to Fox News, said an officer spotted a man acting suspiciously and carrying a rang-finder — a device to measure distance often used by the military.

The officer took a photo of the suspect and reported him to state police before Trump even took the stage, according to the source. Reports indicate that there was a discussion about whether the suspect was carrying a pair of binoculars to have a better view of the rally.

At 6:11 pm, the gunman started firing on Trump. A bullet pierced the former president’s right ear before Secret Service surrounded him. One Trump supporter, a 50-year-old father of two and volunteer firefighter named Corey Comparatore, was tragically shot in the head and killed. Two others were critically injured.

As highlighted by The Daily Wire, video and eyewitness accounts of the time leading up to the assassination attempt show Trump supporters yelling to police about the would-be shooter minutes before he opened fire.

Greg Smith, speaking to the BBC, expressed shock that law enforcement seemed confused and didn’t appear to follow up on those alerts.

“I’m thinking to myself ‘Why is Trump still speaking, why have they not pulled him off the stage,’” Smith said. “The next thing you know, five shots ring out.”

Smith was listening to Trump from just outside the rally and said he saw the shooter “bear-crawl” to the top of a building.

“We noticed the guy bear-crawling up the roof of the building beside us, 50ft away,” he said. “He had a rifle, we could clearly see a rifle.”

“We’re pointing at him, the police are down there running around on the ground, we’re like, ‘Hey man, there’s a guy on the roof with a rifle,’” Smith recalled. “The police did not know what was going on.”

President Joe Biden has since said an investigation will be conducted into the security failures. House Speaker Mike Johnson (R-LA) has also said he will conduct a full investigation into the assassination attempt.

Despite the glaring failure, Secret Service Director Kimberly Cheatle said she would not resign.

Related: WATCH: Eyewitness Says He And Others Tried To Alert Law Enforcement About Attempted Assassin

Ohio Sen. J.D. Vance revealed that former President Donald Trump took time to talk with Vance’s seven-year-old son while offering the senator the role of vice president.

Vance talked to Fox News host Sean Hannity on the sidelines of the Republican National Convention in Milwaukee, Wisconsin, about receiving Trump’s phone call on Monday evening.

“I hope I’m not betraying too many confidences here, but when the president called me today to actually formally offer me to become, you know, the vice presidential nominee – which sounds crazy – my seven-year-old son was kind of making noise in the background,” Vance told Hannity about the call. “You know, I’m getting so embarrassed, I’m like, ‘Oh my God, Donald Trump is asking me to be his vice president.”

“But then [Trump] actually has me put my seven-year-old son on the phone. If you think about this, everything that’s happened, the guy just got shot at a couple of days ago, and he takes the time to talk to my seven-year-old. It’s a moment I’ll never forget,” Vance said.

Trump picked Vance because the Ohio senator was best suited to help the former president “save this country,” Vance said, relaying Trump’s sentiments on the phone call.

“You can help me govern. You can help me win. You can help me in some of these midwestern states like Pennsylvania, Michigan, and so forth,” Vance said.

“He said rightfully that we have been very, very close for a long time, but especially since I endorsed you in 2022, and I would not have won that race without Donald Trump’s endorsement, and the president’s trust then and his partnership since then has been something I value a great deal,” Vance added.

After Trump personally asked Vance to be his vice presidential running mate over the phone, the former president announced his choice on social media.

“After lengthy deliberation and thought, and considering the tremendous talents of many others, I have decided that the person best suited to assume the position of Vice President of the United States is Senator J.D. Vance of the Great State of Ohio,” Trump said, adding that Vance “will continue to fight for our Constitution, stand with our Troops, and will do everything he can to help me MAKE AMERICA GREAT AGAIN.”