NASHVILLE (AP) — Nashville Mayor Megan Barry has revoked the credit card privileges of the Davidson County Election Commission and ordered an audit of all charges paid with tax dollars.

The move on Monday comes after Election Commission Chairman Ron Buchanan announced he would be leaving. The Tennessean (http://goo.gl/t5HWX4 ) reports that Buchanan announced his resignation before WSMV-TV was to air an investigative report on credit card purchases.

The station's report questions expenses of election administrator Kent Wall. While being interviewed, Buchanan is said to have gotten combative with TV reporter Alana Autler and called her a derogatory name.

Attempts to reach Wall were unsuccessful. Buchanan did not respond to a voicemail message. However, he told the newspaper that he meant what he said.