He is doing this, day after day, week after week, month after month, year after year.  And Congress is not stopping him.

Thus Obama eschews enforcement of the immigration laws not because they are comparatively trivial or adequately covered by state police — indeed, his most notable enforcement efforts are directed not at illegal aliens but at states who dare attempt to see to the law’s faithful execution. Obama’s discretionary non-enforcement is not a good-faith husbanding of federal resources but a cynical enterprise in rewarding lawbreakers and cultivating them as a dependable political constituency. His Justice Department practices racial discrimination in the enforcement of the civil-rights laws, a grievous betrayal of the Constitution, in order to appease and empower his political base.

Why do you think Congress does not stop him, since he is violating the law both in his refusal to enforce it and in his objections to the states enforcing it?  Why do you think Congress does not stop him, since he is clearly violating the oath of office that he said when he began to rule?
Why do you think Congress does not stop him?  What are their reasons?
They have the authority and the responsibility to stop him.  But they do not.
Why do you think (not feel–think) — why do you think they do not?
http://www.nationalreview.com/article/353328/obamas-rule-decree-andrew-c-mccarthy/page/0/1?splash