The “fair and equitable†piece is where the Obama administration is most vulnerable, said David Gantz, a trade law professor at the University of Arizona College of Law. “The issue becomes, if there is a very detailed procedure for approval or disapproval of pipelines, whether the U.S. followed those procedures or whether it went beyond the criteria or procedures,†Gantz said. “I would say the U.S. is pretty vulnerable on that one issue,†he said, “in part because the White House staff and others essentially said, ‘we know we’re doing this politically and to make a statement,’ but the regulations...