WATCH: David Prater, Kevin Calvey Addresses OSBI Investigation

Oklahoma County District Attorney David Prater and candidate Kevin Calvey discussed Prater's OSBI referral to look into Calvey's campaign Thursday afternoon.

OSBI confirmed the probe to News 9 Thursday afternoon.

Related: Oklahoma Co. DA Prater, DA Candidate Calvey Discuss OSBI Looking Into Calvey's Campaign

Calvey and Oklahoma County Assistant District Attorney Gayland Gieger will head into a Republican runoff for the D.A. position Aug. 23.