Illegal activity that harms the U.S. is coming from Mexico in much the same way as it does from other corrupt individuals in other countries the U.S. currently sanctions. Texas should compile a list of corrupt Mexican elites and request the federal government to deny them entry to the U.S. or revoke their visas.
Read more in our research on the topic: https://www.texaspolicy.com/hold-them-accountable-mexican-elites-and-the-cartels/