US President Donald Trump said Wednesday he has reached a decision on whether to recertify Irans compliance with an international deal to curb its nuclear program.  Without revealing his decision, Trump told journalists "I have decided" ahead of an October 15 deadline to re-up the agreement. "I’ll let you know what the decision is," he said. Asked whether Trump would withdraw the United States from the deal, the US ambassador to the United Nations, Nikki Haley, said "if he does not certify he certainly has grounds to not do that." Trump’s remarks came as Irans President Hassan Rouhani insisted his country has complied with the nuclear accord it signed with six world powers in 2015, but issued a warning. "It will be a great pity if this agreement were to be destroyed by rogue newcomers to the world of politics. The world will have lost a great opportunity," Rouhani told the UN General Assembly Rouhani warned the fate of the deal cannot be decided by "one or two countries." "By violating its international commitments, the new US administration only destroys its own credibility and undermines international confidence in negotiating with it or accepting its word or promise," he added.