Paper: http://d35brb9zkkbdsd.cloudfront.net/wp-content/uploads/2015/06/10.1007_s11606-015-3418-z.pdf
So we can look forward to conservatives not using this talking point anymore?
KEY RESULTS: From 2000 to 2011, unauthorized immigrants contributed $2.2 to $3.8 billion more than they withdrew annually (a total surplus of $35.1 billion). Had unauthorized immigrants neither contributed to nor withdrawn from the Trust Fund during those 11 years, it would become insolvent in 2029—1 year earlier than currently predicted. If 10 % of unauthorized immigrants became authorized annually for the subsequent 7 years, Trust Fund surpluses contributed by unauthorized immigrants would total $45.7 billion.
CONCLUSIONS: Unauthorized immigrants have prolonged the life of the Medicare Trust Fund. Policies that curtail the influx of unauthorized immigrants may accelerate the Trust Fund’s depletion.
So we can look forward to conservatives not using this talking point anymore?