Treasury Secretary Steven Mnuchin and the Federal Reserve exposed a rare public rift last month when Mr. Mnuchin declined to extend several emergency lending programs put in place to repair credit markets convulsed by the coronavirus pandemic in March.
His decision to allow the programs to expire on Dec. 31 also intensified a partisan divide over the lending programs, which both parties supported as part of the $2 trillion stimulus package known as the Cares Act approved in March.
Sen….