Can’t do it. It would lower the trade deficit. And what then could people whine about?
Given that the US does both, the exporting will decrease the net balance of importing. Should something happen to put a pinch on imports, of course what the Dakota pipeline carries can be put to a higher or complete degree of domestic use.
This kvetching is from environmentalists.
And I’ve seen some pretty bad lying on the part of “American Indian protest movements” that look a lot more like astroturf than anything else. Like the oil drilling in this project, and/or the pipeline, will turn green and grassy meadows interspersed with streams and ponds into something that looks like an alien wasteland.