2. It's called "prosecutorial discretion".
I think you are assuming he will consider himself to be bound by such a little thing as the law.Hers the thing. I think he knew...maybe even planned on democrats getting shellacked this year. Perfect for him. Now, he can blame every obstacle, block, and failing, on the GOP in the house and senate. Even the promised amnesty will be blamed on the GOP, both when he attempts it and when it is deemed unconstitutional. The president cannot grant citizenship.