Amnesty is part of the President of the United States pardon authority, but only on a case-by-case, individual basis. To issue an executive order to blanket amnesty for millions without congressional approval is unconstitutional - unlawful use of executive power. None of those visa extensions or pardons for illegal immigrants received any civil background check.
We have seen the “Change” that Barack Hussein Obama had in mind in 2008, enacted via probably the most corrupted administration in the history of the United States by a president who had stated that he could not declare amnesty for so many illegal immigrants without congressional approval. Using his lawyer skills to circumvent law, more like polluting it, President Obama has done just what he said he could not do lawfully.