The US has immense power. If it imposes sanctions on Iran in any form and chooses to enforce them, it will stop most international trade with Iran. If a company , bank or any economic entity does business with Iran they would then be prevented from any dealing with a US bank or corporation. For instance if Deutsche Bank, Volkswagen , Airbus etc deal with a sanctioned entity in Iran, their interests in the US might be ordered shut or even seized. International economic entities are very reluctant to violate US law. At the least it puts a huge crimp in doing business with Iran. Iran was hurting badly just before Obama unilaterally lifted the sanctions. If Trump imposes sanctions, it will hurt Iran badly.
You act surprised that a clown with a Muslim name, was raised a Muslim in Indonesia, had a Muslim father and step father, school records show he was a Muslim......
America's FIRST Muslim President treats Americans like they are idiots. In many cases, Hussein appears to be right on.