The swelling population of illegal immigrants and their kids is costing American taxpayers $135 billion a year, the highest ever, driven by free medical care, education and a huge law enforcement bill, according to the the most authoritative report on the issue yet.

And despite claims from pro-illegal immigration advocates that the aliens pay significant off-setting taxes back to federal, state and local treasuries, the Federation for American Immigration Reform report tallied just $19 billion, making the final hit to taxpayers about $116 billion.