A suspected gunman was apprehended Saturday after blowing past a security checkpoint at the Washington Hilton just as events were getting underway for the annual White House Correspondents’ Dinner.

The White House Correspondents’ Dinner is an independent celebration of press freedoms.

The bulk of the Justice Department’s motion recounted the events of Saturday night, in which a California man allegedly tried to rush into the WHCA annual dinner and assassinate Trump and members of h...