Republicans hope Sen. Marco Rubio (R-Fla.) can help them reach out to Hispanic voters but any debate on immigration reform could end up alienating the bloc they are courting.

Groups that want to stem the flow of illegal immigration say a bill Rubio has crafted could become a vehicle for other proposals, such as legislation requiring employers to verify the immigration status of workers and revoking birthright citizenship.

Votes on these controversial proposals could hurt Republicans with Hispanic voters but may also rally the GOP base, which wants the federal government to do more to combat illegal immigration.