The US Treasury does not control the money supply. That is the job of the Federal Reserve and by proxy all banks under the Fed system. Pull a US Currency bill out of your wallet, it says it is a Federal Reserve note, if it had anything to do with a government agency then it would say it was a United States note. The US got out of the money business in 1913.
The US mint can make money though, but not currency.
The US mint can make money though, but not currency.