You just can't please Mexico City:

Mexico will send a diplomatic letter to the United States protesting the extension of a wall along the U.S.-California border, officials said Friday.

Ruben Aguilar, a spokesman for President Vicente Fox, said the president would also continue to pressure the U.S. government to approve a migration accord that would allow more migrants to work legally north of the border.

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Mexican Foreign Secretary Luis Ernesto Derbez said Thursday that Fox had instructed him to send the diplomatic letter with the message that the wall's construction was "unacceptable and not a solution."

A corrugated metal wall — dubbed the "Tortilla Wall" — goes all around the edge of Tijuana, but a second and more substantial layer of barriers that was built behind the first one that is incomplete and, among other things, does not stretch out into the Pacific. The measures passed this week allow for the completion of that second layer of barriers.

The upcoming letter will be Mexico's first formal protest of new U.S. immigration regulations that require states to verify that people who apply for a driver's license are in the country legally.

It seems that the only solution that Mexico will find acceptable is one that lets them swarm our borders at will. By such a policy, Mexico may export workers its own inefficient economy doesn't support--and it may export drugs, drug runners and other criminals as well.

Thanks, but no thanks.