Update: Murkowski leaning toward EPA climate resolution over amendment

Her resolution, if successful, would overturn EPA’s “endangerment finding” that greenhouse gases threaten human welfare. The finding is a legal precursor to planned regulations that Murkowski opposes.

Sen. Mary LandrieuMary LandrieuProject Veritas at risk of losing fundraising license in New York, AG warns You want to recall John McCain? Good luck, it will be impossible CNN producer on new O'Keefe video: Voters are 'stupid,' Trump is 'crazy' MORE (D-La.) told reporters Wednesday that she’s working with Murkowski on proposals to prevent EPA from regulating the heat-trapping emissions under its current Clean Air Act powers.

Murkowski's efforts face major hurdles to clearing Congress and becoming law, but could provide a political signal about support for EPA rules if they garner significant Democratic support.

Obama administration officials say they want Congress to pass an emissions-cutting law but are prepared to proceed with EPA rules if Congress does not act.

Murkowski is vice-chair of the Senate Republican Conference and is also the ranking member of the Senate Energy and Natural Resources Committee.