Treasury Secretary Steven Mnuchin, left, and Federal Reserve Board Chair Jerome Powell attend a meeting of world finance ministers and central bank chiefs in October 2019 in Washington, D.C. The two testify at the Senate Tuesday.

Treasury Secretary Steven Mnuchin, left, and Federal Reserve Board Chair Jerome Powell attend a meeting of world finance ministers and central bank chiefs in October 2019 in Washington, D.C. The two testify at the Senate Tuesday.