On Sunday, Steyer joined protesters at the San Francisco airport. Now, he’s saying Trump’s election has convinced him to broaden his focus from the environment to other issues.

Trump threatens “everything we care about: our climate, our economy, our fundamental rights and freedoms, and our republic itself,” Steyer said in a statement. “Trump’s racism, his crass attempts to personally profit from the presidency, and his unquenchable thirst for power have sparked a vital American resistance movement.”

In a video posted Tuesday, Steyer said, “I promise to do everything in my power to stand up to Trump.” When you’ve got a billion dollars to play with, that kind of promise means something.

Making good on the commitment might include a run for office — rumor has it that Steyer may try for the governor’s seat when California’s Jerry Brown steps down in two years.

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Uber’s CEO would like you to re-download the company’s app, please.