Our nation will be entering unprecedented territory if the President grants immigration amnesty via executive order.
Constitutional scholar Jonthan Turley on that topic:
In December 2013, about the President's changes to the ACA, Mr. Turley stated the following in his Congressional testimony about the separation of powers and the dangers of unilateral action:
The danger is quite severe. The problem with what the president is doing is that he's not simply posing a danger to the constitutional system. He's becoming the very danger the Constitution was designed to avoid. That is the concentration of power in every single branch....Time and again, Obama himself has stated that he cannot unilaterally declare immigration policy:
Nevertheless, indications are that Obama is knowingly and willfully precipitating a Constitutional crisis some 15 days after the November 2014 Elections, which did not go the way of the Democratic Party.
Additional reading from the Washington Post: Frustration over stalled immigration action doesn’t mean Obama can act unilaterally (the Post's view, August 5, 2014).