Almost a quarter of U.S. citizens believe the attack on the White House Correspondents’ Dinner last month was staged, a new survey has found. Shots were heard at the Washington Hilton on April 25 as a suspected gunman tried to storm the venue but was apprehended by the Secret Service before he could harm President Donald Trump , his cabinet officials, or other attendees at the black-tie media gala. Cole Tomas Allen , 31, a computer programmer from Torrance, California, has been indicted by a federal grand jury in Washington, D.C., and charged with four felonies, including the attempted assassination of the president. He pleaded not guilty during a Monday court appearance. A YouGov poll published by NewsGuard reveals that 24 percent of Americans believe the episode was fabricated on Trump’s behalf, perhaps to engineer sympathy for the president as his approval ratings slide , with 45 percent confident it was legitimate and 32 percent unsure.…