 The two biggest U.S. natural gas pipelines under construction are likely facing more delays after an appeals court ruling against the Army Corps of Engineers, analysts say. The Trump Administration has aggressively pressed ahead with new pipeline construction, but several projects have run into roadblocks due to successful legal challenges charging that the administration is not applying careful regulatory scrutiny. Last month, a Montana judge ruled the Army Corps authorized permits to cross streams without properly consulting other federal agencies on endangered species. 