Democrats are introducing an extensive immigration bill Thursday that has the backing of the White House and the potential to overhaul decades of existing policy while creating an “earned roadmap” to citizenship for millions of people who are illegally residing in the United States.

Sen. Robert Menendez of New Jersey and Rep. Linda Sanchez of California unveiled the sweeping piece of legislation Thursday as the Biden administration grapples with a mounting crisis on the southern border as thousands of migrants are turned away or released into the U.S. each day.