Democratic senators are asking the Office of the Inspector General of the U.S. Treasury to investigate the planned costs of producing a $250 bill with the image of Trump, which his opponents call “illegal”, Axios reports. The current U.S. legislation does not allow the appearance of living people on banknotes, so the issue of a $250 bill with a portrait of Trump requires mandatory congressional approval. Senators also demand to find out whether the legitimacy of the project was discussed in the department.