The Federal Open Market Committee is meeting this week to set interest rates. The U.S. central bank is widely expected to raise rates after the meeting, which would be its fourth hike this year.
Trump has openly criticized the Fed, as well as Chairman Jerome Powell, multiple times this year. The president has gone so far as to say the Fed has "gone crazy" with monetary policy, and thinks "the rate's too high."
"I think we have much more of a Fed problem than we have a problem with anyone else," Trump said in November.
The Fed did not respond to a request for comment on Trump's Monday tweet.