Sen. Ron Johnson is actively investigating 9/11. A day after the Wisconsin Republican went on a far-right podcast promoting conspiracy theories about the Sept. 11, 2001, terrorist attacks that killed nearly 3,000 people, a spokesperson for Johnson said the lawmaker is currently seeking information and documentation in order to hold hearings on the event nearly 25 years later. He would do so in his capacity as chair of the Senate Permanent Subcommittee on Investigations, one of Congress’s most storied and powerful panels with far-reaching jurisdiction that gives its chair wide latitude to probe a diverse array of matters. It has...