The country's ranchers and cattlemen have a major beef with plans to open the border to Canadian cattle imports.
At a livestock group convention in Denver, the Rancher-Cattlemen's Action Legal Fund, or R-CALF, says resuming Canadian beef imports would likely bring in an influx of Mad Cow disease.
They say there's a 99 percent chance at least one new case of bovine spongiform encephalopathy would occur in the U.S. every year.
Cattle trade was stopped in 2003 after an infected cow was discovered in Alberta. Two more cases have emerged since and one infected cow was discovered in the U.S., costing American ranchers $8.5 billion in beef exports.