Billionaire Tom Steyer is heading into 2018 ready to renew his ongoing efforts to convince Democrats to rally behind the impeachment of President Trump Donald John TrumpHR McMaster says president's policy to withdraw troops from Afghanistan is 'unwise' Cast of 'Parks and Rec' reunite for virtual town hall to address Wisconsin voters Biden says Trump should step down over coronavirus response MORE.

In an interview with local news station KQED in California, the billionaire, who has put tens of millions of dollars of his own money into an effort to impeach Trump, said that he is working to convince Democrats that waiting for the special counsel investigation into Russian collusion is not enough.

"It is an open-and-shut case that he has met the criteria for impeachment," Steyer told KQED. "We're supportive of the [Robert] Mueller investigation, [but] he is investigating two out of the nine criteria that this president has met."

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Steyer says that impeachment is the only remedy for a "dangerously unfit president" such as Trump, but cautioned that the process for removing him should not take place "behind closed doors."

"The people of the United States need to understand that something really wrong has taken place," Steyer said. "This can't happen in a vacuum, behind closed doors. It's a process that we've begun, that is important to begin, because it is urgent and it's bringing in the American people saying, 'take a look, this is dangerous and urgent.' "

Steyer also touched in the interview on a planned announcement Monday about his political future.

In November, the pro-environment businessman dodged questions from CNN over whether he would consider a 2018 primary challenge against California's senior senator, Dianne Feinstein Dianne Emiel FeinsteinSenators offer disaster tax relief bill Democrats back away from quick reversal of Trump tax cuts Congress must save the Postal Service from collapse — our economy depends on it MORE (D).

“Well, I haven't said I'm [considering] running. What I said is I haven’t ruled it out,” Steyer said at the time. “I don’t need to rule it out and I can have time to think about it."