Senator Sheldon Whitehouse of Rhode Island sent a letter to the John F. Kennedy Center for the Performing Arts on Thursday alleging that whistleblowers said renovation work at the center was rushed and that federal contracting rules were ignored. The senator said the center failed to follow its obligations to Congress and its own procurement standards. The allegations include a second botched redo of the reflecting pool and the preparation of the facility for a December event in which Donald Trump received the FIFA peace prize during the World Cup draw he hosted.