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WATCH: inspector general, GAO officials testify on Capitol Police response to Jan. 6 attack

The inspector general and GAO officials testified on the Capitol Police response to the Jan. 6 Capitol attack on Tuesday.

Watch the hearing in the player above.

A bipartisan Senate report released last week details security failures surrounding the Jan. 6 insurrection at the Capitol and recommends how to fix them. But it has only added to the unanswered questions about the attack, when hundreds of former President Donald Trump’s supporters broke through windows and doors and interrupted the certification of President Joe Biden’s win.

The report, which detailed broad failures across government and law enforcement, was narrowly focused and did not examine the broader motivations of the rioters or Trump’s role as he spread lies about his election defeat. The joint investigation by two Senate committees was finished quickly to ensure that the necessary security improvements could be made, and some government agencies didn’t fully cooperate.

The scope of the report was also narrowed to win the support of Republicans, most of whom have signaled they have little interest in revisiting the political motivations of the rioters.

Democrats, and some Republicans, believe that a bipartisan, independent commission is still needed. But Republicans in the Senate blocked legislation that would have created a panel similar to the one that probed the Sept. 11 terrorist attacks 20 years ago, saying another review would be redundant, partisan and unnecessary.

House Speaker Nancy Pelosi has said that if the Senate does not act on the commission, she will move to set up investigations in the House instead.

Democratic Sen. Gary Peters, chair of the Senate Homeland and Governmental Affairs Committee and one of the authors of the Senate report, says that Jan. 6 was an awakening for the country on domestic terrorism in the way that 9/11 was an awakening on international terrorism. A commission would be able to do “a much broader analysis, looking at the bigger picture,” Peters said.