There should be.
Which would mean the end of any surplus refining capacity in the US, closing of more US refineries, investment put into other countries and not the US.
Loss of jobs, worse trade balance, does that really sound like a good idea?
Now we import more crude oil than we need, sell the surplus products at a higher price than we paid for the crude oil.
The is more to economics than just the demand curve. Put more artificial barriers on the industry and you will diminish the supply.