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How would he “illegally introduce a new law”? He could issue a decree but it would be meaningless because nothing gives a president the power to make laws.
https://en.m.wikipedia.org/wiki/List_of_United_States_federal_executive_orders
Read more carefully:
Executive orders are limited to exercising powers already granted to the President by Congress or the Constitution. The President cannot just make up new laws. This is basic stuff that should have been explained to you numerous times if you’re American.