During his confirmation hearing Thursday, Treasury Secretary-designate Steven Mnuchin offered a glimpse into an obscure, but powerful government committee that could join an emerging toolkit the Trump administration could use to launch a global trade war.Asked about the Committee on Foreign Investment in the United States (CFIUS), an interagency committee chaired by the secretary of the treasury, Mnuchin tipped his hand by referring to the committee’s role in “protecting American workers.” But CFIUS is decidedly not about worker protections or economic protectionism.