NASHVILLE, Tenn. (AP) — Democratic U.S. Senate candidate Phil Bredesen is running a TV commercial that says an attack ad against him by the Koch network is "full of flat-out lies."

In a new TV and digital ad Thursday, the former governor also addresses his opponent, Republican Congresswoman Marsha Blackburn, saying she has been "in Washington 16 years now and frankly this ad shows it."

The commercial responds to an Americans for Prosperity ad released Wednesday.

Bredesen's ad says he and his wife never lived in the governor's mansion. The attack says he used $9 million on mansion upgrades and $4 million on an underground meeting hall.

Bredesen's ad hits back against the group's claim that he supported higher gas and sales taxes as governor, when in fact those didn't increase under him.