When Fox News producers and managers find an opportunity to question or challenge a candidate's debate rhetoric, the rational candidate will accept the irrational essence of her/his demagoguery. Donald Trump's debate "Send em South" remarks drew the attention of Bill O'Reilly's crew. Watch O'Reilly challenge Trump about "I love Ike" Operation Wetback program. O'Reilly also criticizes the debates in general.
While O'Reailly backed off to avoid Trump ire, the point was clearly stated, Trump has no civil nor humane plan to remove 11 million people from the United States. It is literally unenforceable without violation of US law.