BUTLER, Pa. — Congress was denied access to the integral Ops Report that details the protection plan for former President Trump's rally, according to a lawmaker who was at Wednesday's FBI briefing and spoke to Fox News Digital on the condition of anonymity.

Paul Mauro, an attorney and retired NYPD inspector, said the Ops Report "should detail who was supposed to cover the area of the roof that (Thomas Matthew) Crooks fired from."

"If there was no Ops Plan done, or if it didn't cover that rooftop, whoever signed off on it failed badly," Mauro said. 

The detailed, written plan was in the hands of the FBI as of Thursday afternoon, according to Mauro, who said the information came from a source "I absolutely, 100% trust." The FBI declined to comment. 

FOLLOW LIVE UP-TO-MINUTE DETAILS OF ATTEMPTED ASSASSINATION

Somehow, Crooks, 20, fell through the cracks, despite several reported sightings as early as an hour before he opened fire on a crowd of people in Butler, Pennsylvania on Saturday.

One bullet nicked Trump's ear, and may have killed him if Trump didn't move his head at that exact moment. 

WATCH: POLICE SEARCH FOR EXPLOSIVES IN CROOKS' VAN

A beloved former fire chief, Corey Comperatore, died while shielding his wife and daughters from a hail of bullets, and two other men were seriously wounded. 

"This was something very, very badly planned," Mauro said. "Just the idea that they had Trump in a car, and couldn't get the car off the grounds because it was locked is unbelievably irresponsible."

Typically, there's a dedicated hospital car and an evacuation plan with a driver who knows a direct route to the hospital, Mauro said.

That "tells me that this thing was done very casually, very under resourced and there was no managing mind over the whole thing," he said. 

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"There wasn't an incident commander. Nobody was really in command. Maybe on paper, there probably was, but whoever it was was asleep at the switch."

Mauro said they were lucky Trump didn't sustain a more serious injury. 

Now that lawmakers are being blocked from seeing the report, and the Secret Service was quick to point the finger at the local police, it screams they're in "cover your a-- mode," he said. 

"There's a lot of culpability, and this idea that, oh, the locals blew it, that idea is already starting to fall apart."

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After 26 seconds of gunfire, Crooks was "neutralized" on the roof that was about 150 yards away from the podium where Trump stood when he was shot. 

Nearly a week after the shooting, there are many unanswered questions and apparent lapses in planning and/or execution. 

WATCH: REPORT ON FORMER CHIEF COREY COMPERATORE

The next step is Monday's House Oversight Committee hearing, where lawmakers will question Secret Service Director Kimberly Cheatle, who agreed to comply with the committee's subpoena. 

The Oversight Committee is led by Rep. James Comer (R-Ky.). 

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"It is good that Comer immediately announced that he would have oversight looking at this, and that he was going to be using the House's subpoena power because you need somebody looking over the shoulder of the task force investigating this," Mauro said. 

"Realistically, they can say they're doing it in conjunction with the Pennsylvania State Police, blah, blah, blah, but the FBI is doing this, and I'm sorry … I don't trust their leadership."

He said there's been way too many failures of late, and he said it's imperative to have someone looking over their shoulder during the investigation.

Earlier this week, the Department of Homeland Security Office of the Inspector General began its "review to examine the process implemented by the United States Secret Service (USSS) to secure" the July 13 political campaign event. 

They're also reviewing the Secret Service Counter Sniper Team "preparedness and operations."

"Our objective is to determine the extent to which the Secret Service Counter Sniper Team is prepared for, and responds to, threats at events attended by designated protectees," the DHS OIG said in a statement. 

The office "continues to consider other reviews related to USSS (United States Secret Service) programs and operations that may arise. DHS OIG will coordinate its reviews with other law enforcement partners, as appropriate."

Donald J. Trump is different. His close brush with death last Saturday has changed him. As he walked into the Finserv Forum on Monday night, the first night of the GOP convention in Milwaukee, the former president was quite clearly moved by the roar of the crowd; he looked on the verge of tears. As he watched his granddaughter Kai speak on Wednesday, he was beaming from ear to ear, clearly proud as a peacock that this beautiful young woman had asked if she could speak the truth about her grandfather – what a caring and involved person he was, and how much she loved him.

And on Thursday, the last night of the convention, Trump was smiling like a kid as Hulk Hogan roared and blustered, and again when a young granddaughter came to sit on his lap. This is a Donald Trump we have never seen before. His guard was down; he was genuinely having fun, grateful perhaps to be alive.

Nothing could be more important for Candidate Trump, who has been vilified by the media for years and cast as a cartoonish, ghoulish villain. Trump emerged from the Republican convention a relatable human being, perhaps for the first time.

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At the end of four buoyant, heartfelt and sometimes electrifying days, the Republican Party gathering came together to embrace their nominee and now officially their candidate for president of the United States. The crowd enthusiastically welcomed the arrival of former first lady Melania Trump, and also the warm-up speakers, shouting "four more years" with Eric Trump, rocking with Kid Rock, praying with Franklin Graham and fist-pumping with Hulk Hogan. 

But the highlight of the night was finally hearing from Donald Trump, who just a few days earlier had nearly been killed by a young man with a rifle, and who thanked God for his deliverance from that near-miss. In the hours after the shooting, the former president said he had torn up the "very tough" speech he had intended to deliver, and instead would be addressing the nation on the importance of bringing the country together.

That he did, at first. His early prepared remarks were pitch perfect for the moment. He talked about what he experienced at the rally in Butler, Pennsylvania, where he was nearly assassinated, and called for a moment of silence for Corey Comperatore, the volunteer fire chief who was tragically killed shielding his family from the bullets.

TRUMP DID SOMETHING HE'S NEVER DONE BEFORE WITH RNC SPEECH. NOW, THE ELECTION MAY ALREADY BE OVER

He brought, as he said, "a message of confidence, strength, and hope." He promised the crowd that "Four months from now, we will have an incredible victory, and we will begin the four greatest years in the history of our country." 

Further, he told his fellow Republicans, "I am running to be president for ALL of America, not half of America, because there is no victory in winning for half of America." At a time when our country appears hopelessly divided, and when the nation’s political rhetoric has become dangerously hot, it is a message voters want to hear. That was also true four years ago, when Joe Biden promised to bring the country together. That he has failed to deliver on that promise makes Trump’s pledge even more meaningful.

Trump promised to resurrect the American Dream and to bring back common sense. He vowed on Day One of his administration to rebuild our energy independence and to secure our border. He declared he would end the push for electric vehicles and slammed the UAW leadership for embracing policies which could harm their workers. He promised prosperity for the middle class. He spoke about the future with enthusiasm and optimism.

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But, as he is wont to do, he went well beyond his teleprompter remarks…way beyond. Some wag tweeted: When they said "four more years," Trump misunderstood.

He could not help himself. In addition to touting the many achievements of his presidency, he attacked the numerous failures and general incompetence of the current "administration." He had vowed he would not mention the current president by name, but slipped up once, saying the damage done by Joe Biden was "unthinkable." He spoke too long, went over the same issues too many times, and left his "unity" message hanging by a thread.

My view: he deserved to do whatever he wanted. This was his moment and it was his prerogative. Donald Trump has been through so much in the past several years: the dishonest paid-for Russia hoax, the impeachments, the bogus lawfare, the indictments and constant, relentless attacks from the establishment, the media and his political opponents. If he wanted to ramble on for an extra 20 minutes, who cares?

The convention audience did not care. They were with him throughout, happy to remember and celebrate the years when he was in the Oval Office and inflation was low, the border was secure, the world was at peace, we achieved energy independence and the economy was strong. 

This was, overall, a Republican convention for the ages – inspirational, moving, and well-organized. The many GOP speakers reveal a deep and promising bench for the future. The ordinary Americans who contributed their life stories, their tragedies and victories, touched all who heard them.

If the campaign is as intelligently managed as the convention, Donald Trump may well become our next president.

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