President Trump on Friday signed a series of executive orders making it easier to fire federal government workers and rolling back the prerogatives of unions that represent them. Andrew Bremberg, the head of the White House Domestic Policy Council, said the president was “fulfilling his promise to promote more efficient government by reforming our Civil Service rules.” Unions representing government workers were quick to denounce the actions, calling them an “assault on democracy,” in the words of the American Federation of Government Employees, the largest federal employee union, which represents 700,000 workers.