Legal and illegal immigrants have been responsible for all the job gains since 2000, according to a CIS report that has finally shed light onto the recent Senate bill's admission, planning to avail all illegal immigrants to U.S. jobs.

The Center for Immigration Studies report shows that 22.4 million immigrants held jobs at the beginning of 2013, which was 5.3 million higher than in 2000. However, native-born Americans have instead dropped 1.3 million in employment to 113.5 million this year, even though the native-born Americans' working-age population have grown by 16.4 million.

The Senate bill's initial opposition Jeff Sessions, an Alabama Republican senator, stated that "the Senate immigration bill massively increases the supply of lower-skilled foreign workers, which would produce lower wages and higher unemployment… Polls clearly show the American people don’t support such an approach."

However, former Florida Gov. Jeb Bush claims that new workers would spur the economy: "To grow economically, the nation needs more young workers, as the population is aging and its growth is slowing… America's educational system produces only a fraction of the high-skilled workers required for technology jobs."

The Senate bill was approved with a 68% majority and is seeking to increase immigration to 46 million by 2033. This report may likely alter its success in the House of Representatives.