The House committee investigating the Jan. 6, 2021, attack on the Capitol is increasingly turning to the Department of Justice as a potential partner for carrying out its mission once the panel sunsets. The two investigative teams have at times been at odds over the last year and a half, with the panel rebuffing a request from the Department of Justice (DOJ) to share transcripts of its interviews in May. But as it stares down an end-of-the-year deadline, the committee’s tune is changing toward something reminiscent of a high school yearbook: Let’s keep in touch. “If they would want to...