This is something I've been worrying about. See A Reader Alerts Us To Rand Paul's Awful New Immigration Plan; Peter Brimelow Comments. 
If Rand Paul wants the Republican Party to be the party of spending cuts, it can't also be the party that "embraces the immigrant ", because each immigrant costs more in taxes than he or she generates in tax revenues. To see "immigrants as assets, not liabilities" is just not good financial sense.
Catalina Camia, USA TODAY 3:52p.m. EST February 12, 2013
GOP Sen. Rand Paul plans to extend a welcoming hand to immigrants and chastise both political parties for spending too much in his remarks Tuesday night aimed at countering President Obama's State of the Union Address.
Paul, a Kentucky senator with presidential aspirations of his own, will be speaking to the Tea Party Express, one of the larger groups in the small-government, anti-tax movement. His remarks will follow the official Republican response to be delivered by Sen. Marco Rubio, R-Fla, another Tea Party favorite.
"We are the party that embraces hard work and ingenuity, therefore we must be the party that embraces the immigrant who wants to come to America for a better future," Paul will say in a speech to the Tea Party Express. "We must be the party who sees immigrants as assets, not liabilities."[More ]