President Donald Trump delivered an “ultimate ultimatum” to Iranian leaders to dismantle their nuclear program, he told reporters on Wednesday, but he said he has not made a final decision about whether to strike Iran and draw Washington into a new conflict in the Middle East. Standing on the south lawn of the White House, Trump was coy about his plans for a potential war with Iran. He said “the next week is going to be big,” and maintained that Iranian officials are eager to negotiate, but explained that after Iran reached out to him, he warned them “it’s very late to be talking.”