Romney says Obama lifted a provision that required people receiving welfare to work. Independent fact checkers have found the premise of the ad to be false.

Last month, Obama moved to allow states to seek waivers from some welfare rules. To get a waiver, states must show their plans would move at least 20 percent more people to work.

Conservatives say waivers will lead to an end of the work requirement. Romney was among several Republican governors who signed a letter in 2005 asking for more flexibility.

The Romney campaign did not say in which states the ad would run. The campaign says Romney will press the welfare issue during a town hall in New Hampshire Monday.