Posse Comitatus Act has already been circumvented during Katrina and now by militarizing local law enforcement.
DHS has granted hundreds of millions across the U.S. to arm local law enforcement, not to mention almost every federal agency now has paramilitary swat teams....even the dept. of education.
Obozo said, “a civilian force, just as well funded...”.
Take a look at the paramilitary in the second link. This is Mongomery county Texas Sheriffs office.
https://www.youtube.com/watch?v=-taU9d26wT4
http://montgomerycountypolicereporter.com/mcso-drone-crashes-into-lake-conroe/
http://www.breitbart.com/Big-Government/2014/05/12/End-Federal-Agency-SWAT-Teams
All govs can send their guard to the border but the state has to cover the entire cost.
So they all want the prez to call out the guard in which case the feds pay half the cost and the state from which the guardsman comes from pays the other half.
When Bush called out the guard, many governors from other states complained about having to pay.
Any many guardsman complain. The signed up to militarily defend the nation but are not pleased to leave their job/career/family to chase wetbacks around the Arizona desert.
It all goes back to the central question: Can the US control the border using enforcement only and how much does enforcement only cost. Or, does the govt have to implement a realistic set of guest worker programs to satisfy the demand by employers for workers, which, coupled with border enforcement, will reduce or eliminate most illegal entry.