The bipartisan House panel investigating the attempted assassination of former President Donald Trump held its first public hearing on Thursday where lawmakers spoke with local law enforcement and a medical examiner about the shooting.

Lawmakers have been ramping up pressure on Secret Service to bolster security around Trump after two attempted assassinations in a two-month span and investigating how two gunmen were able to get so close to him with a weapon. That pattern continued Thursday where lawmakers placed more blame on Secret Service lapses rather than the support they received from local and state law enforcement.

Several members of the task force noted a series of failures and things slipping through the cracks leading to security lapses that allowed the gunman, 20-year-old Thomas Crooks, to get access to a rooftop with a sightline to where Trump was speaking with a gun.

“In the days leading up to the rally, it was not a single mistake that allowed Crooks to outmaneuver one of our country’s most elite group of security professionals. There were security failures on multiple fronts,” said Rep. Mike Kelly, R-Pa., who leads the committee.

Calls on Secret Service to do better were bipartisan. The top-ranking Democrat on the committee said that the agency clearly needed more resources to protect the sensitive political figures it was created to guard but that it must also be held to a zero-fail standard.

"While numerous other state and local law enforcement agencies were present leading up to and during the July 13 event, the Secret Service is ultimately responsible for the safety of its protectives," said Rep. Jason Crow, D-Colo. "It is clear that the Secret Service failed on July 13."

Several of the local law enforcement officials that testified at Thursday's hearing that Secret Service did not task them with defending some of the site's vulnerable points, including the building outside the perimeter that Crooks climbed to open fire at Trump. None of the local law agencies were asked to put agents around the building or on the roof during the rally despite the vulnerabilities it posed.

"We were certainly prepared for the missions that they had given us. There were additional things obviously that probably needed covered, but they never asked us to do that. They never tasked us with that," Butler County Emergency Services Unit commander Edward Lenz said.

The decision not to include the building from which Crooks fired from in the security perimeter has also come under heavy scrutiny. In the Senate report, who exactly was responsible for deciding what became part of the perimeter in the security plan for the Butler rally was subject to vague responses and finger-pointing.

Secret Service agents said they thought local law enforcement was covering the building, while Butler officials said they had told Secret Service they did not have the ability to. According to the report, Secret Service was told two days in advance that local law enforcement did not have the manpower to lock down the building.

"A 10-year-old looking at that satellite image could have seen that the greatest threat posted to the president that day outside the security perimeter was the AGR building and that roof," said Rep. Pat Fallon, R-Texas. "A 20-year-old with a week's notice figured it out and outsmarted and outmaneuvered the entire U.S. Secret Service and that is a shame and a stain on their agency."

Thursday’s hearing comes a day after a Senate committee noting “foreseeable, preventable” that led to a gunman getting access to a roof with a sightline to Trump and being able to open fire. That report was similar to a five-page document from an that also found numerous communication failures between local law enforcement and Secret Service.

Included in the Senate report was findings that there was no clear chain of command among law enforcement or plans to cover the building that the gunman climbed on top of to fire shots from. Several of the local law enforcement witnesses at Thursday's hearing testified to that regard, saying that counter sniper teams were not given clear directives on what they were assigned to guard.

The House task force that was created to investigate the shooting has visited the rally site and conducted interviews with law enforcement that was involved in security for the rally. It is also investigating a second attempt on Trump's life earlier this month when a man with a rifle at the former president's golf course was spotted aiming the weapon through shrubs on the line of the property.

A Secret Service agent spotted the rifle and opened fire on the suspect, Ryan Routh, who fled the area and was later arrested.