DHS is immigration enforcement, taking in the old INS.
The easiest way he can do it is to have the State Dept. issue legal resident status for all of them as refugees of the worn torn holes they crawled out of...just like they just did with Haitian illegal aliens and so many others.
Still, don't see it happening. As corrupt and wily as obambi is, I believe he knows that will be his end. He thinks he would have a new huge voting bloc to stop the massacre come this November, but the TEA Party demonstration in DC will be nothing compared to what would happen if he tries this. And yes, I said try, because it simply would not stand with the majority of Americans.
The above would be the flash point for me. It would be proof positive that America is now a dictatorship by presidential decree (pretty much there anyway). I would not let such a thing happen without a real fight. I've had a great ride...
Best,