A southeastern New Mexico company’s plans to convert a cattle plant into a horse slaughterhouse has hit another roadblock, this time over an environmental dispute that the company’s attorney blames on the Obama administration putting politics over policy.

Blair Dunn, who represents Valley Meat Co. of Roswell in its more than yearlong effort to get approval to slaughter horses, says the U.S. Department of Agriculture keeps changing the rules because it opposes horse slaughter.

USDA officials referred questions to the Justice Department, which did not immediately respond to a phone call seeking comment.