The Fed is maintaining its benchmark interest rate in the range of 4.25% to 4.5%, where it's been parked since December.

U.S. Treasury yields were flat on Tuesday, just ahead of the Federal Reserve's two-day policy meeting. At 4:09 a.m. ET, the 10-year Treasury yield was down less than one basis point at 4.414%. The 2-year yield was less than one basis point higher at 3.922%, and the 30-year yield was also under one basis point higher at 4.959%.