Authors of the immigration bill, which was introduced last month by a group of four Republican and four Democratic senators, are waiting to get an official estimate of the costs of the bill from the Congressional Budget Office. They have pledged it will not cost the government money, partly because the bill puts immigrants who have been in the country illegally in a provisional legal status for 10 years during which they can't get government benefits. The CBO typically measures costs of bills over a 10-year period.

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