SPRINGFIELD -- Illinois Gov. Pat Quinn won't say why one of his top aides is stepping down.

Quinn's office confirmed Monday that Deputy Chief of Staff Carolyn Brown Hodge resigned late Friday. Monday was her last day on the job.

But neither Quinn nor his aides would say why.

Citing unnamed sources, the Chicago Sun-Times reports that a state inspector general is looking into whether Hodge performed political work on state time.

Quinn rival Dan Hynes says the report raises serious questions. The Democratic candidate for governor says he hopes any investigation is done quickly and thoroughly.