EXCLUSIVE: Speaker Mike Johnson, R-La., is questioning Secret Service Director Kimberly Cheatle’s decision to appear at the Republican National Convention (RNC) on Wednesday night, as House GOP leaders push for accountability for the security failures that led to the attempted assassination of former President Trump.

"I’m not sure what she was doing here. Why would she walk around when she's under so much scrutiny?" Johnson told Fox News Digital in an interview at the RNC in Milwaukee. 

"I don't understand her decision-making process, and I don't think she's fit to lead at this critical time."

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The embattled Secret Service director was seen in the RNC venue on Wednesday, where she was confronted by several Republican senators who have been dissatisfied with her answers thus far on what happened last weekend.

Johnson, for his part, is the highest-ranking official so far to call for Cheatle’s resignation in the wake of the deadly rally shooting in Butler, Pennsylvania, last weekend. 

He’s now commissioning a bipartisan task force, armed with subpoena power, to investigate the security failings that led to a 20-year-old gunman being able to fire shots off a roof just outside of the rally perimeter despite being seen beforehand by local law enforcement and civilians.

"Her excuses for this just make no sense," Johnson said. "I think accountability begins at the top. And I think everybody in this business understands that it's very important, and it’s critically important for us to get the answers and accountability quickly so that people don't make up their minds about some conspiracy theory or some sinister plot."

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He warned that "some of those rumors have begun already, and we have to address that immediately."

House lawmakers held a call with Cheatle and FBI Director Christopher Wray on Wednesday to address their concerns about the incident. A source familiar with the call told Fox News Digital at the time that it lasted roughly 45 minutes and offered limited insight.

Johnson similarly said on Thursday that he learned "very little" on the call.

"That’s the problem," Johnson said. "They're not providing answers quickly enough and the answers they do provide are not satisfactory."

The speaker questioned President Biden’s decision to appoint Cheatle in the first place, arguing her focus on diversity efforts within the Secret Service took away from more critical efforts.

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"She doesn't seem to be the most qualified person, and she doesn't seem to have a great grasp of what her primary responsibility is," he said. "We've all seen and heard the accounts of her suggesting that, you know, that the number one priority was having more diversity in the Secret Service and more female officers, etc. That is not the number one priority. The number one priority is the safety of the persons that they are supposed to be protecting."

The speaker's office told Fox News Digital that he is aiming to schedule a classified briefing on the shooting next week.

Fox News Digital reached out to the Secret Service for comment.

The 20-year-old loner who attempted to assassinate former President Trump on Saturday had an account on the encrypted Discord app, a sign that he preferred anonymous interactions to real-world relationships, experts told Fox News Digital.

A spokesperson for the platform confirmed that Thomas Matthew Crooks had an account and that it had been deactivated by Discord after the assassination attempt that wounded Trump and killed a rally attendee.

"It was rarely utilized, has not been used in months, and we have found no evidence that it was used to plan this incident, promote violence or discuss his political views," the spokesperson said. "Discord strongly condemns violence of any kind, including political violence, and we will continue to coordinate closely with law enforcement."

Fox News learned late Wednesday that Crooks wrote an ominous message on the gaming platform Steam, "July 13 will be my premiere, watch as it unfolds." His laptop also had searches in early July for Trump, Biden, when is DNC convention, and July 13 Trump rally.

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Retired FBI agent and behavior analysis expert Jim Clemente said the Discord community is especially popular with gamers and that Crooks' usage comes as no surprise.

"It's encrypted, so it does provide a level of privacy and anonymity," he said. "So, somebody who might feel disenfranchised, a loner who felt bullied, those kinds of people, it’s very common for them to spend more time online interacting with others rather than the real world because their experiences with the real world are so negative."

Crooks, who graduated from Bethel Park High School in Pennsylvania in 2022, was relentlessly bullied over his appearance and awkward social graces, classmates have told numerous outlets.

One peer said he would often sit alone during lunch and was teased without mercy.

"It doesn’t surprise me that he has a Discord account and not a Facebook account, which is very interactive and image-based and extremely social," Clemente said. "Discord is a more private way to communicate."

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Former FBI profiler Mary Ellen O'Toole also highlighted Discord's popularity with avid video game players and said Crooks may well have been a regular gamer.

"It's fantasy life," she said. "They get lost in it, and it makes them feel like a big man. If he were really active, that would be one thing, but the fact that he wasn’t, we just don't know much about him. He’s the kind of person you'd walk right past without even blinking. He was so nondescript."

O'Toole also noted that Crooks appeared to have a very limited social media footprint.

"If you're bullied in reality in school, you wouldn't risk being bullied online," she said. "It’s called social media for a reason. You're relating to other people in a society, and this kid was a loner and possibly because he was bullied so badly from the way he looked, the way he dressed."

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O'Toole said young people who are outwardly mute are often raging internally.

"It's the quiet ones you have to worry about because you don't know what they're thinking," she said. "That statement really applies to this situation. The bureau has his computers. They got his phone. His parents have been very cooperative. If he's the kind of person who wrote down his thoughts in any way, it's going to come out."

Clemente said his parents – both counselors – appeared oblivious to the level of his inner torment.

Crooks, he said, was likely aware that he would not emerge from the incident alive.

"I believe he knew he would not survive this event, and he wanted to make the biggest possible splash in the process," he said. "I do know that he probably felt it was fortuitous that an opportunity presented itself so close to home that he was able to take advantage of it."

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Crooks opened fire from a rooftop at a rally in Butler, Pennsylvania, on Saturday, clipping Trump's right ear and killing volunteer fire chief Corey Comperatore.

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Two other people were injured before Secret Service agents shot and killed Crooks.

Fox News Digital's Louis Casiano contributed to this report.