The nation’s top historic preservation group is suing the Trump administration to block construction of President Donald Trump’s plans for a massive new White House ballroom until review boards weigh in on the project. The National Trust for Historic Preservation, a congressionally chartered non-profit tasked with preserving historic buildings, said it was bringing the suit because its previous letter urging a pause on the project had gone unheeded. CNN's Brian Todd and Kevin Liptak report. #CNN #News