Trump's decision to decertify nuclear deal harms US credibility - Iranian FM | 14 Oct 2017 | US President Donald Trump's recent decision not to recertify Tehran's compliance with the 2015 nuclear agreement will only undermine Washington's own credibility in the international arena, Iranian Foreign Minister Mohammad Javad Zarif said. "Nobody else will trust any US administration to engage in any long-term negotiation because the length of any commitment, the duration of any commitment from now on with any US administration would be the remainder of the term of that president," the top Iranian diplomat told CBS News.