Democratic mega-donor Tom Steyer took aim at President Trump Donald John TrumpBiden on Trump's refusal to commit to peaceful transfer of power: 'What country are we in?' Romney: 'Unthinkable and unacceptable' to not commit to peaceful transition of power Two Louisville police officers shot amid Breonna Taylor grand jury protests MORE on Saturday, accusing the president of "holding the government hostage" with his "temper tantrum" over border funding.

“Donald Trump is holding the government hostage over an unrealistic and inflammatory promise he made to his supporters,” Steyer, a vocal Trump critic who has called for his impeachment, said in a statement.

”His temper tantrum will cost more than 420,000 federal employees their pay over the holidays, and another 380,000 people will be placed on temporary leave without pay."

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Senate Democratic Leader Charles Schumer Chuck SchumerCruz blocks amended resolution honoring Ginsburg over language about her dying wish Senate Democrats introduce legislation to probe politicization of pandemic response Schumer interrupted during live briefing by heckler: 'Stop lying to the people' MORE (N.Y.), House Democratic Leader Nancy Pelosi Nancy PelosiHoyer: House should vote on COVID-19 aid — with or without a bipartisan deal Ruth Bader Ginsburg lies in repose at Supreme Court McCarthy threatens motion to oust Pelosi if she moves forward with impeachment MORE (Calif.) and a number of other Democrats have used similar language, dubbing the latest partial government shutdown a result of the president's "temper tantrum."

"This is just another example of why Trump is unfit for office," Steyer said in his statement Saturday.

"He must be removed. He has knowingly and repeatedly obstructed justice, eroded our democracy to enrich himself, has been implicated in several felonies, and just this week, was forced to dissolve his corrupt foundation. It is no longer a question of whether he should be impeached, but of whether members of Congress will have the courage to remove him from power."

Steyer founded Need to Impeach, a campaign aimed at removing Trump from the presidency, last year. The billionaire hedge fudge manager has funneled more than $40 million into the effort.

The environmental activist has been mulling a possible 2020 White House bid in an effort to take on Trump and has visited a series of early voting states while exploring a bid.

"We need a president who fights for the American people and improves our country, not one who threatens the jobs and well-being of federal employees to promote his racist agenda,” he said Saturday.

A partial government shutdown began Saturday after the Senate could not find a compromise on the House funding bill passed Thursday, which included $5 billion in funding for Trump's border wall.