President Joe Biden on Sunday plans to sign into law a measure that boosts Social Security payments for current and former public employees, affecting nearly 3 million people who receive pensions from their time as teachers, firefighters, police officers and in other public service jobs.

For the past half-century, union officials representing these groups have been pressuring Congress to eliminate WEP because they wrongly think the law cheats their members out of Social Security benefits they are due. In each of those years, a bill to eliminate WEP has failed to get approved.