NASHVILLE, Tenn. (AP) -- A super political action committee is working against U.S. Rep. Diane Black in the Aug. 2 primary and its sole contributor was formerly the chief fundraiser for Black's opponent, Lou Ann Zelenik.

Black's campaign charges that this violates federal rules that require PACs to operate independently from campaigns. Zelenik's campaign vigorously denies any coordination with Citizens 4 Ethics in government.

The political blog Open Secrets reported this week that thousands of dollars raised by Citizens 4 Ethics has come from Andrew Miller of the Tennessee Freedom Coalition.

According to the Federal Election Commission, the group has spent more than $30,000 on the 6th District primary.

Miller told The Associated Press that he contributed the more than $180,000 raised by the PAC and that the money spent so far is to target Black.