Because of the ideology of globalism - which is liberalism's government "diversty" slogans, Mexico mistakes itself as powerful enough to dictate to the US and all other countries. What a mistake...BIG MISTAKE.
Vicente Fox is not stupid. He knows that if he raises enough h*ll and gets the Mexicans in the U.S. to raise enough h*ll that the politicians will back down on this. They can pass any law they want but enforcement is still an issue. We already have plenty of immigration laws on the books now that they CHOOSE not to enforce. Vicente Fox is well aware of this.
At this point I have more faith in Fox accomplishing his goal than I do our own politicians, been there done that.