Iran nuclear talks in crisis as Obama threatens to walk away

President Obama threatened Tuesday to "walk away" from a nuclear deal unless Iran agrees to "serious, rigorous verification mechanism" to make sure it is complying with the terms of any deal. As the negotiations were extended past their Tuesday deadline for an extra week, sharp disagreements emerged. Obama said at a joint White House press conference with visiting Brazilian President Dilma Rousseff: "I've said from the start, I will walk away from the negotiations if in fact it's a bad deal." And he pointed specifically to a persistent disagreement over inspections of nuclear sites. Without those inspections and assurances that a path to a nuclear weapon is closed off, Obama said, "Then we're not going to get a deal." 

Obama said the inspections cannot just consist of "declarations" from Iran and "a few inspectors wandering around every once in a while." Obama suggested that Iran was in fact backtracking from its initial commitments in a framework announced earlier this year.