Sen. James Inhofe (R-Okla.) announced plans Thursday to force a Senate vote on killing new Environmental Protection Agency rules to curb emissions of mercury and other air toxics from coal-fired power plants.

“Today the United States Senate can look forward to having one more opportunity to stand up to President Obama’s war on affordable energy,” Inhofe, the top Republican on the Senate Environment and Public Works Committee, said in a statement.

The senator, a persistent EPA critic, will have a tough time winning a floor vote. But the plan nonetheless sets up an election-year political showdown over EPA policies that are in the crosshairs of Capitol Hill Republicans and the party’s White House hopefuls.