WASHINGTON (AP) — The U.S. immigration system would undergo dramatic changes under a bipartisan Senate bill that puts a new focus on prospective immigrants' merit and employment potential, while seeking to end illegal immigration once and for all by creating legal avenues for workers to come here.

The bill would put the 11 million immigrants in the country illegally on a 13-year path to U.S. citizenship that would cost each $2,000 in fines plus additional fees, and would begin only after steps have been taken to secure the border, according to an outline of the measure.

The sweeping legislation also would remake the nation's inefficient legal immigration system, creating new immigration opportunities for tens of thousands of high- and low-skilled workers, as well as a new "merit visa" aimed at bringing people with talents to the U.S. Senators had planned to formally introduce the bill Tuesday, but after Monday's bombing at the Boston Marathon a planned press event was delayed until later in the week.