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OAKLAND — San Francisco billionaire Tom Steyer rallied anti-Trump activists and bashed Democratic leaders for not supporting efforts to impeach the president at a boisterous meeting in Oakland on Wednesday night.

At an event that felt like a venting session for Trump-weary liberals, the former hedge fund chief outlined his case for impeachment, as speculation grows in Washington, D.C., that the president might try to fire the special counsel investigating his campaign.

Steyer, who’s spent more than $30 million on his impeachment campaign, has blanketed airwaves with pro-impeachment TV ads and collected more than 5 million signatures. Now he’s embarking on a series of town-hall meetings around the country to build grassroots support for yanking Trump from office.

He spoke Wednesday at the Impact Hub, a community center in uptown Oakland, alongside Amy Siskind, a Wall Street executive-turned-blogger who wrote a book cataloguing what she calls Trump’s “authoritarian” actions.

Nuance was not the order of the night.

“He is a malignant narcissist who’s deteriorating,” Steyer said of Trump, predicting that the president’s mental state would progressively decline over the course of his administration. “Today is the best day of the rest of the Trump administration.”

Siskind declared that Immigration and Customs Enforcement under Trump was “very similar to the uprise of Hitler’s gestapo.”

An overflow crowd of about 400 people showed up despite drizzly weather — including former Warriors star Adonal Foyle, who snapped iPhone shots of Steyer during the meeting.

Other Democratic leaders have argued that focusing too much on impeachment could drown out their message on other issues and alienate independent voters that the party needs to win to take back Congress this year. House Minority Leader Nancy Pelosi and others have urged their caucus not to fan the flames of impeachment.

But Steyer argued there wasn’t time to wait. “They’re saying, ‘don’t tell the truth because the American people are not equipped to handle it,’” he said, accusing leaders in Washington, D.C., of being focused on “a game between Republicans and Democrats.”

He gave a shout-out to Rep. Barbara Lee, D-Oakland, who was one of 66 House Democrats to vote to move forward with debate over articles of impeachment in January.

And Steyer did identify one silver lining in the Trump administration, saying the president “has been so bad that he has reinvigorated our democracy” and inspired more people to get involved in politics.

The crowd ate it up. “Tom Steyer, you’re a hero,” declared one man who asked a question. “I totally disagree with everybody who criticizes you,” added another questioner.

Meanwhile, Steyer is also bankrolling a separate $30 million voter registration effort to help Democrats retake Congress in this year’s midterm elections. There’s speculation that he’s considering a 2020 run for president, although he insisted he was focused only on helping other candidates in 2018.

The large number of Republican retirements in Congress — including House Speaker Paul Ryan — is like “rats leaving a sinking ship,” he told reporters after the event. He also said he was “rethinking” a decision not to get involved in Democrat-on-Democrat primary races.

Several of the anti-Trump faithful who showed up on Wednesday said they thought more Democrats should follow Steyer’s lead and stake out a hard line on impeachment. Darlene Beard, who lives in Oakland, thanked Steyer for his efforts to “get rid of the godawful man in the White House.”

“Trump may be his own downfall, eventually,” she predicted.

Jonathan King, a Hayward 29-year-old with a long beard, said he hadn’t been paying much attention to politics before Trump’s election, but now he’s disgusted with the president’s “World War II Germany-style approach to governing.”

“He’ll stop at nothing,” King said. “We need to fight back.”