The panel announced that the meeting will be held on July 12 at 10 am. It is expected to be led by Rep. Jamie Raskin, D-Maryland, and Rep. Stephanie Murphy, D-Florida, who plan to chart the rise of the right-wing domestic violent extremist groups that attacked Capitol Hill and how Mr. Trump rallied and inspired the mob. The panel also plans to detail known ties and conversations between political figures close to Mr. Trump and extremists. The hearing will be the first since explosive, surprise testimony last week by Cassidy Hutchinson, a senior White House aide to Mr. Trump, who came forward to provide a damning account of the president’s actions on Jan. 6, 2021. She recounted how the Mr. Trump, knowing his supporters were armed and threatening violence, wanted to relax security to allow them to move freely in Washington, urging them to march on Capitol Hill and seeking to join them there. She testified that she overheard a conversation in which Mark Meadows, the White House chief of staff and her boss at the time, said that Mr. Trump had privately sided with rioters as they stormed the building and called for Vice President Mike to be hanged. Pence, saying he deserved it and that his supporters did the right thing. The select committee has held seven public hearings to date, starting with one last year in which it highlighted the testimony of four police officers who fought the mob and helped secure the Capitol. After conducting more than 1,000 interviews, the commission launched a series of public hearings last month to present its investigation findings, including one that focused heavily on the role of the extremist group Proud Boys in the building invasion. The next session focused on how Mr. Trump spread the lie of a stolen election despite being told repeatedly that the vote was legal, defrauding his donors and defrauding his supporters in the process. Subsequent hearings focused on how Mr. Trump pressed Mr. Pence, state officials and the Justice Department in a barrage of increasingly desperate efforts to overturn the election. In a recent interview with The New York Times, Mr. Raskin declined to provide specific details about communications between political figures close to Mr. Trump and militia groups. But he said it was clear no mob would have come to Washington or descended on Capitol Hill if not for Mr. Trump’s directive. “Donald Trump appealed to the mob. called the mob to Washington,” Mr. Raskin said, adding, “All this was aimed at the joint session of Congress.”