Steven Mnuchin, Treasury secretary nominee for President Donald Trump, speaks during a Senate hearing in Washington on Jan. 19. Photographer: Andrew Harrer/Bloomberg The Senate confirmed Steven T. Mnuchin as Treasury secretary Monday evening, putting an end to a contentious and protracted debate while adding another former banker to President Trump’s roster of advisers. Mnuchin ran a bank, OneWest, that foreclosed on tens of thousands of Americans following the financial crisis, and Democrats argued that he would not represent the financial interests of ordinary Americans in office.