In the report, Mr. Miller suggested that the “temperature has cooled on oversight” and said flatly that “things are not working well.” He warned that there would be negative consequences as a result.
“Unfortunately, many of these promising developments, including criminal investigations and leads, will now need to be closed or transferred,” Mr. Miller wrote.
Spokesmen for the White House and the Treasury Department had no immediate comment.
The report contained a letter responding to Mr. Miller’s complaints from Laurie Schaffer, the Treasury Department’s principal deputy general counsel, who said that the department believed that the special inspector general had oversight only of the Treasury’s direct loans and its investments in Federal Reserve facilities. She said that the rest of the relief funds that the department had been managing were being tracked by other oversight bodies but that the department had nevertheless tried to be cooperative.
“Treasury is dedicated to the prevention of waste, fraud and abuse, and we are committed to being responsive and helpful to S.I.G.P.R.,” Ms. Schaffer wrote in the letter, dated April 27, using an abbreviation for the special inspector general.
Mr. Miller served as an inspector general for the General Services Administration from 2005 to 2014. He had been working as a White House lawyer when Mr. Trump tapped him for his current job, and Democrats, who were worried about the Trump administration’s management of relief money, were fearful at the time that Mr. Miller would be a toothless inspector general.