He will order the U.S. government not to enforce the law against these 5 million, and declare that they are to be exempt from deportation and granted green cards.
Where did Obama get his 4-5 million figure, not 2-4 million, or 5-7 million? Nowhere in law, but plucked out of his own mind, as to what he can get away with. Barack Obama just felt it was about right. Thus does our constitutional law professor-president "faithfully execute" the laws of the United States he has twice swore to uphold?
Our rogue president has crossed an historic line, and so has the republic. Future presidents will cite the "Obama precedent" when they declare they will henceforth not enforce this or that law, because of a prior commitment to some noisy constituency.
We have just taken a monumental step away from republicanism toward Caesarism. For this is rule by diktat, the rejection of which sparked the American Revolution.
The political, psychological and moral effects of Obama's action will be dramatic. Sheriffs, border patrol, and immigration authorities, who have put their lives on the line to secure our broken borders, have been made to look like fools. Resentment and cynicism over Obama's action will be deeply corrosive to all law enforcement.