WASHINGTON — A chorus of bipartisan criticism is mounting over the security loopholes at the venue for the annual White House Correspondents’ Dinner — while President Trump and his allies insisted Saturday’s shooting proves the need for his planned über-secure White House ballroom. Critics slammed the security loopholes that allowed guests to check into the historic Washington Hilton hotel without undergoing weapons screenings from the outside. Authorities say that’s how Cole Tomas Allen was able to sneak a shotgun, a handgun and multiple knives into the building where President Trump, most of his cabinet, and many top members of congress were mingling with journalists. President Trump renewed his push for a White House ballroom after the shooting on Saturday. Getty Images The White House ballroom project has faced legal snags in court.…