The AFL-CIO said Thursday that it would oppose congressional passage of President Trump’s U.S.-Mexico-Canada Agreement on trade if Mexico doesn’t first change its labor laws to conform to the deal.

“[T]he current draft of the new NAFTA recognizes [that] Mexico must enact and fully and effectively implement reforms to its labor law … This must happen before Congress takes up any new NAFTA deal. But if the Administration insists on a premature vote on the new NAFTA in its current form, we will have no choice but to oppose it,” the AFL-CIO said in a statement posted Thursday.