Donald Trump just called for OPEC to lower oil prices:
We protect the countries of the Middle East, they would not be safe for very long without us, and yet they continue to push for higher and higher oil prices! We will remember. The OPEC monopoly must get prices down now!
—Donald Trump via Twitter (2018-09-20)
Well, oil-rich countries do pay billions for purchasing F-15, F-16, Patriots, and so on. They also support Petrodollar system. Apparently, the USA is actually protecting its superpower status by protecting Persian Gulf countries.
So, why is Trump calling for OPEC to lower oil prices?