Sen. Lamar Alexander, R-Tenn.
Earlier this week, we talked about a debate among lawmakers over emissions at coal power plants.
A new ad targets U.S. Senator Lamar Alexander's support for an EPA plan called Utility MACT.
It would require hundreds of coal plants to add costly new emissions controls or risk shut down.
Supporters say this would have health and environmental benefits, but opponents say it would force many coal plants to increase utility rates or close completely.
We heard from Senator Alexander on Monday about this while he was in D.C.
Friday, he spoke at Twin City Nissan about the same issue.
"I believe the EPA is right on these two clean air bills, and the reason is that it will stop dirty air from blowing into Tennessee because they are gong to require utilities from other states to put on the same pollution control equipment that TVA is putting on and we are going to pay for. So if we are going to do it, then they should do it because they are the source of a lot of our air pollution," he said.
The new plan would require coal plants to update their emission controls by adding new scrubbers and filters to limit the amount of harmful chemicals released into the air.
U.S. Senator James Inhofe from Oklahoma introduced a measure that would block Utility MACT from going forward.
The Senate is expected to vote on the issue in the coming weeks.