Rep. Steve Daines (R-Mont.) has introduced a bill to block implementation of the Obama administration's proposed regulations to cut power plants' carbon emissions.
The Senate candidate said the regulations would threaten jobs in his state, which has a prominent coal industry.
Under Daines's measure, the EPA regulations could not take effect unless the Labor Department certifies that the rules would not cost jobs, the Congressional Budget Office finds that the regulations would not result in a lower gross domestic product and agencies verify that electricity costs and availability would not change.
Rep. Nick Rahall (D-W.Va.), one of the most vulnerable incumbents this election cycle, also introduced a bill last week that would block the EPA regulations.