(AP) -- Republican presidential candidate Rick Santorum and front-runner Mitt Romney are trading barbs over who's the toughest on canceling voting rights for convicted felons.
Santorum says Romney is promoting lies when he stands by attack ads run by Romney's supporters in South Carolina.
One pro-Romney ad shows a prison inmate and says Santorum supported allowing felons to vote. Santorum said Tuesday in Charleston, S.C., that such tactics "lead to real serious questions about whether that man can be trusted to tell the truth on a variety of things."
Romney shrugged off the criticism. He says Santorum is in favor of allowing felons to vote again once they've served their sentences - while Romney would still ban them from voting.
Their remarks continued a dispute that began in Monday night's GOP debate.
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