Civil Service rules make it difficult, but not impossible to terminate Federal employees. Federal unions have some collective bargaining power over nonwage compensation, etc., and they can represent workers in disciplinary or termination hearings. That’s about it.
Maybe. HeSheIt altered information on an official website. It was deliberate. It was insubordinate. It was directed at the American public and the president. It might be like falsifying a document which is a big no-no.