President-elect Donald Trump plans to launch a mass deportation operation targeting millions of immigrants living in the U.S. illegally and with temporary protections once he takes office on Jan. 20, a challenging initiative that could split apart families and affect U.S. businesses.

The Senate recently passed the Social Security Fairness Act, which now heads to President Biden, who is expected to sign it into law. The bill would eliminate two key Social Security provisions that reduce benefits for government employees who have certain types of pensions.