The House select committee investigating the January 6 insurrection at the U.S. Capitol will hold its first public hearing next week, promising the revelation of “previously unseen material” on efforts to disrupt the 2020 presidential election.

The committee has for 10 months probed nearly every aspect of the attack that occurred during the certification of President Joe Biden’s victory in the 2020 election. When the committee gavels in at 8 p.m. on June 9, lawmakers said they will provide a summary of a “coordinated, multi-step effort to overturn the 2020 presidential election.”

Next Thursday’s primetime hearing will be the first in a series of six public hearings during which the committee said it will describe how former President Donald Trump and his allies attempted to overturn his loss in the election, the Associated Press said. The former president spread false information about voter fraud that was widely debunked in court and by Trump’s own administration, leading to the attack on the Capitol building two months after the election.

House Speaker Nancy Pelosi charged the select committee with investigating “the facts, circumstances, and causes relating to the domestic terrorist attack on the Capitol.”

The nine-person body consists of seven Democrats and two Republicans — Rep. Liz Cheney of Wyoming and Rep Adam Kinzinger of Illinois.

The committee has interviewed more than 1,000 people, the AP said, but few portions of their testimony have been publicized.

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