President Trump announced Friday that he is decertifying the Iran deal, and issued new sanctions on Iran's Revolutionary Guard. But he did not withdraw the U.S. from the agreement, instead punting the decision to Congress. This was expected, and comes despite criticism from U.S. allies and other member countries who insist that Iran is fulfilling its obligations, and warn that any change in the agreement could lead to a new nuclear buildup in the Middle East.
Why it matters: The world is already facing a mounting nuclear problem with North Korea. It doesn't want to risk another one with Iran. Trump argues, however, that the deal has emboldened Iran and is counter to U.S. interests.