An immigration reform bill that would create a guest worker program pushed by President George W. Bush and give millions of illegal immigrants a chance to earn citizenship was approved on Monday by a U.S. Senate panel.

The first step toward comprehensive legislation was passed by the Senate Judiciary Committee and now goes to the full Senate for debate.Including the contested guest worker program, which would allow future temporary workers a chance to become permanent residents, sets the stage for a bruising battle over immigration.

The bill would also give some of the millions of illegal immigrants a chance to legalize their status and earn eventual citizenship.House of Representatives-passed legislation has focused solely on tightening border security and enforcing immigration law, and many conservative Republicans say the guest worker provision is a form of amnesty.