(AP) — Groups that represent retirees and union workers are planning to encircle the Federal Building in Lincoln to protest possible Social Security benefit cuts.

Group members will form a “human chain” around the Robert Denney Federal Building and U.S. Courthouse on Tuesday at 5 p.m. The gathering is organized by the Nebraska Alliance for Retired Americans and the Nebraska State AFL-CIO.

The coalition is protesting a change that would result in smaller annual increases for Social Security recipients. The increases are designed to protect against inflation.

Supporters say the current formula is outdated and doesn’t reflect actual cost-of-living increases. Group members argue that a new proposed measure, the chained Consumer Price Index, fails to account for large health care costs for seniors and people with disabilities.