The Senate campaign of Rep. Denny Rehberg (R) is running another ad responding to a spot launched a couple of weeks ago by Sen. Jon Tester (D) that charged the Congressman with voting against cancer funding.

“Newspapers across Montana say Jon Tester’s attack on Denny Rehberg is not true,” the ad’s announcer says.

This is Rehberg’s second ad in two weeks since Tester launched an ad on July 11 that featured a cancer survivor and charged that Rehberg supported a 2011 appropriations bill that reduced funding for breast cancer screenings. Rehberg responded last week with an ad featuring his mother, a cancer survivor.