Let's not mix the ban on Iranian nationals and the ban on refugees. Two separate things. When an Iranian applies for a Visa (which they must before being able to enter the U.S.), it's the bureaucracy of Iran that allows them to provide documents on everything from birth certificates to bank statements.Iran is a very well organized country, with a functional bureaucracy. One of its missions, declared officially for many years which included a proxy war, is the end of America (and Israel). It is therefore plausible that the Iranian bureaucracy might not be willing to cooperate with the American bureaucracy in vetting refugees and those asking for a visa, thus exponentially increasing the risk of issuing a visa to a dangerous element of the Iranian nation.
And while Iran has declared America to be a mortal enemy, they also signed a nuclear agreement with a group of countries that included the U.S.. And more importantly, Iran has long stopped terrorist attacks in the West, there is no ISIS in Iran.
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Show me which presidents have issued entry bans based on nationality.Why is it that when this President does this, it makes top headlines but when many presidents before him have done the same, no one seems to remember?