More than four months after hundreds of protesters stormed the U.S. Capitol to disrupt the certification of Joe Biden’s victory in the presidential election, House Democrats plan to bring up legislation to create a commission to investigate the incident.

Speaker Nancy Pelosi said she is “optimistic” the two parties can agree on legislation that would create a 10-member bipartisan panel evenly appointed by each party and equipped with subpoena power to take a closer look at what provoked the attack and how Capitol security failed to prevent hundreds of protesters from gaining entry into the building while lawmakers in the House and Senate met to certify the 2020 election.