Photo by Andrew Leyden/Getty Images “I’ve never been in a vehicle that moved so fast,” someone in the presidential motorcade messaged me as it sped from the White House Correspondents’ Association dinner after a shooter was taken into custody by the Secret Service outside the main dining room of the Washington Hilton Hotel. Donald Trump had been onstage when the shooting began, due to give a speech at the annual dinner. I watched the motorcade rush into the north side of the White House from the steps of the Renwick Art Gallery opposite the residence. British flags fluttered on the lamp posts in advance of the King’s visit. People were scrambling to leave the Substack party I was attending. The company’s staff were told by the Secret Service to prevent people from leaving the top floor of the building. They formed an imperious barrier atop the stairs. The shooter, reportedly carrying a shotgun, handgun and a knife, was tackled near the main dinner’s screening area.…