The popular measure gives full benefits to millions of people who currently receive them at a reduced level. Critics warn the $196 billion cost will speed up the program’s insolvency.

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 Windfall Elimination Provision (WEP) reduces Social Security for those who earn “non-covered” pension income their jobs, which are typically public sector roles, that didn’t contribute Social Security payroll taxes. Those workers can lose up to half the pension amount.