The proposed 10-member commission, which emulates the panel that investigated the causes and lessons of the 9/11 terrorist attacks, would be vested with subpoena authority and charged with studying the events and run-up to Jan. 6 — with a focus on why an estimated 10,000 supporters of former president Donald Trump swarmed the Capitol grounds and, more important, what factors instigated about 800 of them to break inside. Trump’s critics in both political parties view it as a means to bring further public scrutiny to his role in inspiring the violence.