U.S. Treasury sanctions chief Mandelker leaving for private sector

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