But 20 decades later, veterans of the commission's investigation into the 2001 terror strikes worry it will be difficult to keep politics from a question into the Jan. 6 attack which resulted in President Donald Trump's unprecedented second impeachment, on charges he incited the riot.
His attorneys argued he was not accountable for the violence in the Capitol and contrary to the propriety of convicting a former president. Seven Republicans joined all 50 Democrats at the 57-43 vote, short of this two-thirds bulk required for conviction.
According to interviews with ABC News, Kean, Hamilton and Roemer said that they told Pelosi a prosperous commission would necessitate appointing members that are able to prevent the partisan fray, providing them with sufficient resources and supplying enough time to research on their own schedule, instead of one laid from Congress or the White House.
"You can't have individuals on the commission whose job is to shield the president defend the speaker," said Kean, a Republican, and also seat of their 9/11 Commission. "You have to get people who follow the truth."
To dull partisanship on the board, Kean established a solid connection with Hamilton and did not employ any staff who had recently worked on a political effort.
The composition of this committee is imperative to its achievement, additional Roemer, that has been consulting Pelosi and her team over the previous two weeks about the building of the laws.
"You want to select those who've worked throughout the aisle and have profound knowledge in the problem areas involved. The commission will probably be 10 or 11 people, together with the president having to decide on the seat and the leadership picking different folks," Roemer said.
The 9/11 Commission faced resistance in the Bush White House since it researched what intelligence was understood about the plot prior to the assault, and it had been forced to complete its investigation prior to the 2004 election,'' Kean remembered.
"The mandate, the remit, the goal part of the legislative should be particular, it has to be accurate and it has to be crystal clear," Roemer said. "It shouldn't be just about how to safeguard the Capitol complex or high the walls ought to be, it also needs to contain what led to strikes and the best way to strengthen the institutions of our representative democracy."
It is not yet obvious whether Republicans will back the speaker's attempt. At least 10 Republicans need to support any proposition from the Senate to clean the 60-vote filibuster threshold at the room to pass the laws.
House Minority Leader Kevin McCarthy, R-Calif., was noncommittal at a statement to ABC News, also pointed into the commission laws proposed by House Republicans a few weeks past.
"It's our obligation to know the wisdom and security breakdowns that caused the riots on January 6 so we could better protect this association and the women and men working within ," his statement read. "A commission must adhere to the advice of Tom Kean and Lee Hamilton to become'equally independent and bipartisan,' and also to maintain that integrity it has to be evenly divided between both parties."
A number of Trump's greatest allies in Congress have attempted to shift blame to Pelosi -- questioning her managing of Capitol safety before the assault -- and may bristle at any nearer evaluation of Trump.
"I wish to check at exactly what Pelosi knew, when she knew it, what President Trump failed after the assault, and also on the Senate side, was Senate leadership advised of a hazard?"
"For this to function," Pelosi said through a media conference on Thursday,"it actually must be firmly bipartisan. You must have subpoena power."
"This is the answer to gaining access to individuals and data in this circumstance," Roemer told ABC News. "Obtaining access to this substance that has been out there once President Trump was in the office and the collaboration of important witnesses -- subpoenaing those men and women who had been there. Others might be utterly eager to come back in without a subpoena."
Initial Republican and Democratic proposals to the commission disagree on the scope of the question, whether members of Congress could function on the board, and if it'd research problems like online disinformation.
Philip Zelikow, a professor in the University of Virginia who served as the executive manager of this 9/11 Commission and aided writer its bestselling report, told ABC News the continuing FBI investigations into Capitol rioters could produce"plenty of hindrances and possible delays" in addition to any investigations into Trump's telephone call with Georgia's secretary of state.
"We did benefit from a gigantic FBI investigation," he explained of this 9/11 Commission. "However, the FBI investigation wasn't at the process of being introduced to a grand jury."
John Farmer, a former attorney general of New Jersey who served as senior adviser about the 9/11 Commission, told ABC News that the panel needs to be in a position to confer resistance to witnesses in exchange for assistance, to incentivize alliance, even though that could complicate continuing criminal investigations and potential queries into holding individuals accountable for the assault.
"A judgment is going to need to be produced in certain cases whether a complete account of what occurred on Jan. 6 is far significantly more significant than human culpability," Farmer said.
At least seven House and Senate committees are also conducting their own investigations to the assault, seeking documents and testimony from senior congressional safety officials, both the FBI and societal networking platforms, for example Parler, that police say were used by rioters to communicate in front of their siege.
On Friday, the FBI and National Counterterrorism Center made records into the House panels as part of the inquiry into what national intelligence agencies knew about the prospect of an attack before Jan. 6, a House committee official told ABC News. The Department of Homeland Security is expected to create records for its committees in the forthcoming weeks.
Many House and Senate panels aim to maintain the initial public hearings about the Jan. 6 attack, including former and current congressional security officers, next week.
Hamilton, the 9/11 Commission co-chair, stated the hardest work will be ensuring that any recommendations that the commission ends up earning are passed to legislation.
"There is not any magic , no formula, only common sense and also the political will to take action," he told ABC News.