On Wednesday, a statement by Transportation Secretary Sean Duffy prompted a prominent retired military prosecutor to reveal his unvarnished thoughts about what he called the “vulgar” “MAGA cult.”This criticism flared after Duffy spoke at the National Mall as part of the country’s 250th birthday celebrations, from which a slew of musical performers had quit over the hyper-partisan nature of the event. After the likes of Martina McBride, Flo Rida,…