On a Tuesday afternoon in late April, Representative Marjorie Taylor Greene walks into the seventh-floor congressional office belonging to Representative Matt Gaetz, settles into a high-backed black leather chair, and fits a pair of headphones over her blonde hair. The taping is about to begin for the 38th episode of Gaetz’s “Firebrand” podcast, and Greene is the high-wattage guest star. Greene has come straight from Dulles Airport, so Gaetz takes a minute to catch her up on today’s topics before the recording starts. There is much to discuss: the latest Anthony Fauci-related controversy; Greene’s trip to the U.S.-Mexico border; the...