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A prominent member of the Republican National Committee is calling for the national organization to investigate the “racially divisive ads and robocalls” that targeted conservative state Sen. Chris McDaniel in Mississippi’s Republican Senate run-off last month.

Ed Martin, the chairman of the Missouri Republican Party, sent a letter to RNC chairman Reince Priebus requesting him to appoint a special committee of RNC members to “investigate this matter” and report back on its findings.