Marsha Blackburn Enforce Quotations

I think people have found it very interesting that those that enforce ObamaCare, those that wrote Obamacare, are not a part of ObamaCare.

If a president can enforce a part of a law and delay a part of a law, then does he have a power to not enforce any law he so chooses? If he can allow illegal aliens to freely run across our border, can he force legal citizens out of the country? Where would be the end of his power?