From this:

Without announcing his intentions to do so, President Bush has decided to support the creation of a North American Union through a process of governmental regulations, never having to bring the issue before the American people for a clear referendum or vote.

The Bush Administration has decided to "back-door" the creation of a North American Union political entity that would effectively erase our borders with Mexico and Canada and create several super-regional governing bodies that would have jurisdiction over the U.S. Congress and the U.S. Supreme Court...

Much more at the link, and recall that earlier this week Vicente Fox had this to say:

"The future of North America must guarantee great competitiveness, greater regional security..."

In 2002 he said:

"Eventually, our long-range objective is to establish with the United States, but also with Canada, our other regional partner, an ensemble of connections and institutions similar to those created by the European Union..."

More in "CFR's Plan to Integrate the U.S., Mexico and Canada", Should you trust anything Sen. John Cornyn says?, Charlie Norwood on CATO's latest anti-American proposal, and The "New Partnership in North America": double-plus NAFTA