Illegal immigration has been used as a campaign issue, by both parties, for decades. Actually doing something meaningful, either way, would remove or diminish the usefulness of the issue at election time.
Republicans argue to deport the sods at election time, except the rest of the time when their backers urge more immigrants for businesses.
Democrats argue for amnesty at election time, except the rest of the time when Obama has set deportation records.
And "The Beat Goes On."