The number of low-skill guest workers allowed into the US would start out at 200,000 a year and rise to 400,000, per another amendment from Senator Lee.
By contrast, the original immigration reform bill calls for a steady buildup of visas for such workers, starting at 20,000 a year and gradually increasing to 200,000.
Conservatives such as Lee are concerned that provisions for bringing new workers into the country aren't big enough for the needs of American businesses – but just how many more workers they believe the US needs was unclear until Lee's amendment.