Subject: Well...
We should see this one coming soon:

Trump declares a National Emergency at the border and orders the military to provide men for a civilian controlled operation to build the wall and detention centers, etc. It might not be limited to the construction projects. There is no emergency so we'll have to see how this plays out. Posse Comatitis should apply.

SNIP
NOW, THEREFORE, I, DONALD J. TRUMP, President of the United States of America, by the authority vested in me by the Constitution and the laws of the United States of America, including sections 201 and 301 of the National Emergencies Act (50 U.S.C. 1601 et seq.), hereby declare that a national emergency exists at the southern border of the United States, and that section 12302 of title 10, United States Code, is invoked and made available, according to its terms, to the Secretaries of the military departments concerned, subject to the direction of the Secretary of Defense.  To provide additional authority to the Department of Defense to support the Federal Government’s response to the emergency at the southern border, I hereby declare that this emergency requires use of the Armed Forces and, in accordance with section 301 of the National Emergencies Act (50 U.S.C. 1631), that the construction authority provided in section 2808 of title 10, United States Code, is invoked and made available, according to its terms, to the Secretary of Defense and, at the discretion of the Secretary of Defense, to the Secretaries of the military departments.  I hereby direct as follows:

Section 1.  Deployment of Personnel and Resources.  The Secretary of Defense, or the Secretary of each relevant military department, as appropriate and consistent with applicable law, shall order as many units or members of the Armed Forces, including the Ready Reserve and the National Guard, as the Secretary of Defense determines to be appropriate to support the activities of the Secretary of Homeland Security in obtaining complete operational control of the southern border of the United States.  The Secretary of Defense shall further take all appropriate action to facilitate the operational needs of the Secretary of Homeland Security along the southern border, including through the provision of appropriate detention space, transportation (including aircraft), and other logistics services in support of civilian-controlled law enforcement operations.

Sec. 2.  Additional Physical Barriers.  The Secretaries of Defense and Homeland Security shall immediately take all appropriate action, consistent with law, including 10 U.S.C. 2214, to construct additional physical barriers along the southern border.  To the extent possible, the Secretaries of Defense and Homeland Security shall coordinate with any Governor of a State that is willing to assist with the deployment of any physical infrastructure to improve operational security at the southern border. SNIP