My theory is that he wants to use the sale of US fossil fuels to pay off the debt. Maybe that's bogus, just my uneducated opinion!
(I also think it's incredibly shortsighted)
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So that's not even remotely economically sound or logical.
In conclusion you're probably right.
Joining OPEC would subject the United States to production quotas. We're the world's largest oil producer. But we're also the largest consumer.