Across the vast federal bureaucracy, Donald J. Trump's arrival in the White House has spread anxiety, frustration, fear and resistance among many of the two million nonpolitical civil servants who say they work for the public, not a particular president. At the Environmental Protection Agency, a group of scientists strategized this past week about how to slow-walk President Trump’s environmental orders without being fired. At the Treasury Department, civil servants are quietly gathering information about whistle-blower protections as they polish their resumes. At the United States Digital Service - the youthful cadre of employees who left jobs at Google, Facebook...