President Joe Biden signed a measure into law on Sunday that boosts Social Security retirement payments to some retirees who draw public pensions, such as former police officers and firefighters, in what the White House described as the first expansion of such benefits in 20 years. The Senate voted last month to approve the Social Security Fairness Act, which would repeal two-decade-old provisions that can reduce benefits for people who also receive a pension. The House of Representatives had approved it earlier.