Billionaire Democratic donor Tom Steyer wrote a letter to Democrats on Wednesday demanding the party pledge to impeach President Trump if they take control of Congress next year.

In a letter first reported by The New York Times, the California mega-donor calls Trump a “clear and present danger to the republic," and urges Democratic lawmakers to "make your position clear" regarding removing the president from office.

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“This is not just an issue of Twitter screeds but what it means for a person who has control over our nuclear arsenal,” Steyer said Wednesday.

“I hope you will make your position clear so that Democratic voters who are under constant attack by this administration, know their elected representatives have the patriotism and political courage to stand up and take action.”

Steyer also appeared to take a shot at California Sen. Dianne Feinstein Dianne Emiel FeinsteinMcConnell says Trump nominee to replace Ginsburg will get Senate vote Top Democrats call for DOJ watchdog to probe Barr over possible 2020 election influence Intensifying natural disasters do little to move needle on climate efforts MORE (D), who announced Monday that she will seek reelection next year.

Feinstein angered some Democrats in August when she said that Trump had an opportunity to be a "good" president.

“It is clear for all to see that there is zero reason to believe ‘he can be a good president,’” Steyer wrote in his letter.

Steyer spent more than $91 million supporting Democrats in the last election cycle, and there has been some speculation that he could consider running against Feinstein.