Senator Josh Hawley has expanded his oversight investigation into the US Postal Service, accusing Postmaster General David Steiner of failing to respond adequately to Congress. The dispute matters because it concerns the postal service’s accountability to elected lawmakers and its management of potential operational changes.

In a strongly worded letter, the Missouri Republican demanded records relating to the agency’s use of outside restructuring advisers, including Alvarez & Marsal. Hawley’s action follows wider scrutiny of USPS performance, finances and proposed policy changes, although the article does not include a response from Steiner or the postal service.