The correct answer to this open question is the following.
The combatant command responsible for conducting civil support operations (including consequence management operations) in accordance with US laws within the established area of operations is the United States Northern Command.
As part of the Defense Department of the United States, the US Nothern Command was created on October 1, 2002. One of its basic functions is to support and protect United States citizens. The command is able to detect threats to national security and its leader has established agreements with allies such as México and Canada to better protect the nation.