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WASHINGTON, DC - DECEMBER 08: Sen. Chuck Grassley (R) (R-IA) meets with Treasury Secretary nominee Steven Mnuchin (L) December 8, 2016 in Washington, DC. Mnuchin was recently nominated to head the Department of Treasury by President-elect Donald Trump. (Photo by Win McNamee/Getty Images)

WASHINGTON, DC - DECEMBER 08:  Sen. Chuck Grassley (R) (R-IA) meets with Treasury Secretary nominee Steven Mnuchin (L) December 8, 2016 in Washington, DC. Mnuchin was recently nominated to head the Department of Treasury by President-elect Donald Trump.  (Photo by Win McNamee/Getty Images)