Rep. Vicente Gonzalez (D-Texas) is asking Mexico to address highway safety as he weighs his vote on President Trump Donald John TrumpFederal prosecutor speaks out, says Barr 'has brought shame' on Justice Dept. Former Pence aide: White House staffers discussed Trump refusing to leave office Progressive group buys domain name of Trump's No. 1 Supreme Court pick MORE’s new North American trade deal.

Gonzalez sent letters to Mexican Ambassador Martha Bárcena and Secretary of Security and Civilian Protection Alfonso Durazo asking Mexico to ensure that Highway 40, which connects the two countries and is part of the safe highway program, is secured before his vote on the United States-Mexico-Canada Agreement (USMCA), his office said Tuesday.

USMCA is the Trump administration’s proposed trade deal to replace the North American Free Trade Agreement. ADVERTISEMENT

The security and safety of cross-border commerce and travel is a top concern for Gonzalez as he considers his vote on USMCA, his staff said in a release, adding that there are no protection guarantees in place for freight and passenger vehicles leading up to the bridges that connect the U.S. and Mexico.

“For the United States and Mexico to continue reaping the benefits of North American trade, each country must fulfill its commitments to efficiency, security and rule of law,” Gonzalez said in a statement.

“Proper implementation of the Safe Highway program will undoubtably allow for the successful implementation of the United States-Mexico-Canada Agreement and encourage more cross-border commerce. I ask that the Mexican government make it a priority to secure Highway 40D all the way to each international bridge connecting Tamaulipas with South Texas.”

Republicans are making the deal a top priority for the fall session, but Democrats may not be quick to approve it.

House Democrats have sought changes to the deal over enforcement, environment, labor and pharmaceuticals.

Senate Finance Committee Chairman Chuck Grassley Charles (Chuck) Ernest GrassleyGOP lawmakers distance themselves from Trump comments on transfer of power The Hill's 12:30 Report: Ginsburg lies in repose Top GOP senators say Hunter Biden's work 'cast a shadow' over Obama Ukraine policy MORE (R-Iowa) wrote in an op-ed published last week that he is "engaged in ongoing discussions" with lawmakers and Trump about the next steps on the deal.