Washington state Gov. Jay Inslee (D) signed a pledge Tuesday promising to reject donations from the fossil fuel industry ahead of a likely run for the White House that he’s vowed to uniquely center on climate change.

In an interview with HuffPost, Inslee, 67, said he added his name to the list of more than 1,300 politicians across the United States who took the No Fossil Fuel Money Pledge.

The vow, administered by a coalition of 16 left-leaning environmental groups, commits candidates to “adopt a policy to not knowingly accept any contributions over $200 from the PACs, executives, or front groups of fossil fuel companies — companies whose primary business is the extraction, processing, distribution, or sale of oil, gas, or coal.”

By Alexander C. Kaufman, Huffington Post