Sigal Mandelker, the U.S. Treasury official who oversaw the Trump administration's aggressive use of
sanctions as a foreign policy tool, has resigned to return to the private sector, the U.S. Treasury secretary said on Wednesday.
"She is a fierce advocate for effectively leveraging our powerful economic tools to make an impact for a safer world," Mnuchin said in a statement.
As undersecretary for terrorism and financial intelligence since June 2017, Mandelker supervised the ramping up of sanctions against
Iran, mainly aimed at strangling oil exports after the
United States left the 2015 landmark
nuclear deal with Iran.