To those saying Obama did the same thing. Such a claim is simply false. Obama's ruling only targeted one country (Iraq) and it wasn't a ban in any way. It was a revetting of thousands of recently admitted refugees. This slowed the process of accurately vetting incoming refugees so the entry of many Iraqi refugees was delayed and at least 1000 refugees were informed improperly that they were not granted visas. In Trump's case, Trump is simply allowing NO nationals from these countries access to the US even if they have been vetted.