That’s the BIG problem - the Mexicans think that the SW United States belongs to them.
There does need to be a full investigation, consulates closed down, Operation Wetback from the 1950’s ramped back up again, cut off govt funds for illegals, build the wall, etc, etc.
Time to get tough with the Mexicans before there is another full-scale war with Mexico.
Mexico started the Mexican American war. We won it AND paid them 50 million in gold for land we won. We then PURCHASED the south portion of Arizona per the Gadsden Purchase.
This looney idea that Mexico should get the Western portion of the US back is propagandize in the schools, on Mexican talk shows and novellas.