Last week, Sen. Charles Grassley raised questions about the sudden “retirement” of Amtrak IG Fred Weiderhold: As a senior member of the United States Senate and as the Ranking Member of the Senate Committee on Finance (Committee), it is my duty under the Constitution to ensure that Inspectors General, which were created by Congress, are permitted to operate without political pressure or interference from their respective agencies. Inspectors General were designed for the express purpose of combating waste, fraud, and abuse and to be independent watchdogs ensuring that federal agencies were held accountable for their actions. I understand that Inspector...