U.S. Senate's Mitch McConnell walks through the U.S. Capitol in Washington, U.S., December 16, 2020.

Senior lawmakers reached a compromise over the Federal Reserve's emergency lending powers late Saturday night, overcoming a major hurdle that prevented Congress from completing a $900 billion coronavirus relief package earlier in the week, according to multiple sources.

A last-minute roadblock emerged on Friday as Democrats accused Republicans, namely Pennsylvania's Sen. Pat Toomey, of attempting to encumber the incoming Biden administration by cutting off the Federal Reserve's emergency lending abilities created by the CARES Act meant to protect the already battered economy.