BISMARCK, N.D. (AP) — A federal judge's order for more environmental review of the already-operating Dakota Access oil pipeline has several potential outcomes, all of which could spark even more wrangling in a Washington, D.C., court room. The big question is whether the pipeline will be shut down while the case plays out — and if so, for how long.

Some questions and answers about the case:

WHAT IS THE PIPELINE AGAIN?

The $3.8 billion pipeline built by Texas-based Energy Transfer Partners moves oil from western North Dakota to a distribution point in Illinois, where it can be shipped to the Gu...