Groups opposed to mass immigration are the latest organizations to join in the heated debate on Capitol Hill over Trade Promotion Authority, also known as “Fast Track,” arguing the legislation could be a “Trojan horse” for expanding guest worker programs.

The U.S. Trade Representative’s Office and the lawmakers sponsoring the legislation have pushed back, saying there is simply no truth to the claim that Fast Track or the administration’s other initiative, the Trans-Pacific Partnership trade deal, include provisions that could expand immigration.