The White House released a statement yesterday following their decision to deploy 1,200 National Guard troops to the border to target illicit trafficking networks:

The President is committed to a strategic approach, consisting of a requirements-based, temporary utilization of up to 1,200 additional National Guard troops to bridge to longer-term enhancements in border protection and law enforcement personnel from the Departments of Homeland Security and Justice to target illicit networks’ trafficking in people, drugs, illegal weapons, money, and the violence associated with these illegal activities.

Later in the day Mexican President Calderon set the rules for the troops.
From the Mexican Foreign Ministry, via Michelle Malkin:

Regarding the Administration’s decision to send 1,200 National Guard servicemen to the US Southern border, the Government of Mexico trusts that this decision will help to channel additional US resources to enhance efforts to prevent the illegal flows of weapons and bulk cash into Mexico, which provide organized crime with its firepower and its ability to corrupt.

Additionally, the Government of Mexico expects that National Guard personnel will strengthen US operations in the fight against transnational organized crime that operates on both sides of our common border and that it will not, in accordance to its legal obligations, conduct activities directly linked to the enforcement of immigration laws.

At least we know who the boss is.(OBOWMA is at it again the man has no balls!)