Sens. Ted Cruz, R-Texas, and Pat Roberts, R-Kan., warned Tuesday that pulling out of the North American Free Trade Agreement would be disastrous for the U.S. economy, particularly in the agriculture and energy industries.

The talks to renegotiate the 1993 trade deal between the U.S., Canada, and Mexico have been going poorly, and the three countries’ top negotiators have publicly traded barbs over the effort. This has raised the possibility that President Trump will follow through with his earlier threats to pull out of the deal.