With an 80-19 margin for passage, if the Mexican government is unwilling to come to an agreement on this issue, it is quite possible the Senate could vote to nullify the treaty in whole or in part.
That is the point in summary. Political posturing, and nothing more on the part of our politicos. When a radical such as I proposes anything with teeth, both sides defer. If the status quo is acceptable, so be it. Yet the House bill indicates that we the people are fed up. The Senate bill does not bother me on a personal level. For our Texas legislature and county commissioners courts will take it up. The other states are kind of on their own. Exactly what does it take for the Mexican government to reach an agreement? Appeasement and deference have not worked to date.