TOPEKA, Kan. (AP) -- Gov. Sam Brownback is preparing to fill a vacancy in his Cabinet and sign an executive order that advances his plan to overhaul the state's Medicaid program by reorganizing three state agencies.

Brownback's staff wasn't saying ahead of his Friday morning news conference what major administrative position would be filled.

However, Jeff Kahrs has been serving as acting secretary of the Department of Social and Rehabilitation Services since Secretary Rob Siedlecki stepped down at the end of last year.

SRS would be reorganized under the Medicaid plan, along with the Department on Aging and the Department of Health and Environment. Programs would be shifted among the agencies, and they'd get new names.

The $2.9 billion Medicaid program provides health coverage for the poor, disabled and elderly.