World leaders, senior U.S. officials and U.S. lawmakers are all pressuring President Trump not to decertify the landmark 2015 nuclear deal with Iran, which Trump is expected to do as early as Friday. Among those pressuring Trump is former Israeli Prime Minister Ehud Barak, known as an anti-Iran hawk, who nevertheless is calling the proposed withdrawal a mistake. U.S. Defense Secretary James Mattis has also urged Trump to stick with the deal, and the Trump administration itself has certified that Iran has complied with its obligations.