I'm sure these guys are lying since the word "conservative" is listed in the description.
In 2013, the conservative think tank The Heritage Foundation released a study concluding that at the current time (before amnesty), the average unlawful immigrant household has a net deficit (benefits received minus taxes paid) of $14,387 per household. During the interim phase immediately after amnesty, tax payments would increase more than government benefits, and the average fiscal deficit for former unlawful immigrant households would fall to $11,455. At the end of the interim period, unlawful immigrants would become eligible for means-tested welfare and medical subsidies under Obamacare. Average benefits would rise to $43,900 per household; tax payments would remain around $16,000; the average fiscal deficit (benefits minus taxes) would be about $28,000 per household. Amnesty would also raise retirement costs by making unlawful immigrants eligible for Social Security and Medicare, resulting in a net fiscal deficit of around $22,700 per retired amnesty recipient per year.