The Senate has agreed to end debate on a controversial immigration bill, setting the stage for a vote likely to come today. The bill would heighten enforcement measures, establish a temporary guest worker program, punish employers who hire undocumented immigrants and open a route to citizenship for at least some undocumented immigrants. If passed, the Senate bill would have to be reconciled with the Sensenbrenner bill passed by the House in December. That bill focuses strictly on enforcement and would consider undocumented immigrants to be felons. It would also make it a crime for priests, nuns, health care workers and other social workers to offer help to undocumented immigrants.