Have you ever heard of the Northern Command, also known as Norcom? Probably not.
Have you heard of moves to integrate the United States, Canada, and Mexico into one judicial authority? Probably.
Here is the description of Norcom on Wikipedia.
United States Northern Command (USNORTHCOM) is a Unified Combatant Command of the U.S. military tasked with providing military support for civil authorities in the U.S., and protecting the territory and national interests of the United States within the contiguous United States, Alaska, Canada, Mexico (and the air, land and sea approaches to these areas).
USNORTHCOM was created on April 25, 2002 when President George W. Bush approved a new Unified Command Plan, following the 11 September 2001 attacks. USNORTHCOM went operational on October 1, 2002.
The support that USNORTHCOM provides to civil authorities is legally limited by the Posse Comitatus Act, which sets some limits on the role of the U.S. military in civilian law enforcement. However, in case of national emergency, natural or man-made, its Air Forces Northern National Security Emergency Preparedness Directorate will take charge of the situation or event.
It gets better (or worse).
USNORTHCOM is composed of several standing Joint Task Forces (JTFs) previously assigned to United States Joint Forces Command (USJFCOM): Joint Force Headquarters National Capital Region, Joint Task Force-Civil Support, Joint Task Force Alaska, and Joint Task Force North. USNORTHCOM service components include U.S. Fifth Army/ARNORTH, First Air Force/AFNORTH, and United States Fleet Forces Command.
What does it do?
NORTHCOMM operates extensive domestic intelligence operations which both share and receive information from local, state and federal law enforcement agencies. Employees of the FBI, CIA, NSA, DIA, NGA, and other agencies maintain offices at NORTHCOMM and receive daily intelligence briefings.
In Exercise Vigilant Shield 2008, Northern Command, Pacific Command, the Department of Homeland Security, and numerous law enforcement agencies across the U.S. conducted exercises to test their “response abilities against a variety of potential threats”.