There have already been a few articles on this:

Go ahead, stop American diesel exports. Diesel production generates unnecessary byproducts like kerosene. If you stop diesel exports, the storage facilities for byproducts will fill up pretty quickly, and as a result, American refineries will scale back their production because they certainly aren’t going to throw money away by disposing of byproducts. Ultimately, the U.S. will have even less diesel in the near future than it does now…

It’s hard to imagine anyone more incompetent than Trump.