Some of the nation’s ultrarich are calling for higher taxes — on themselves.

In an open letter published Monday on Medium, billionaires and heirs to fortunes urged 2020 presidential candidates to impose a wealth tax on the richest Americans. The letter cites support for proposals that would address the nation’s staggering wealth inequality through taxation, such as an existing plan put forth by Sen. Elizabeth Warren, D-Mass.

“We are writing to call on all candidates for President, whether they are Republicans or Democrats, to support a moderate wealth tax on the fortunes of the richest 1/10 of the richest 1% of Americans — on us,” the co-signatories wrote. “The next dollar of new tax revenue should come from the most financially fortunate, not from middle-income and lower-income Americans.”

The group of wealthy individuals includes Abigail Disney, the independent filmmaker and activist and an heir to the Disney entertainment empire; Facebook co-founder Chris Hughes; investor and liberal donor George Soros; and Regan Pritzker, board chair of the Libra Foundation.

The letter says that “America has a moral, ethical and economic responsibility to tax our wealth more. A wealth tax could help address the climate crisis, improve the economy, improve health outcomes, fairly create opportunity, and strengthen our democratic freedoms.

“Instituting a wealth tax is in the interest of our republic,” they wrote.

The proposal, the letter writers said, would implement a tax of 2 cents on the dollar on assets over $50 million and an additional tax of 1 cent on the dollar on assets over $1 billion. It would generate nearly $3 trillion in tax revenue over 10 years, they said.

Recent polls show 50 percent of Republican voters support a wealth tax, compared with nearly three-quarters of Democrats.

Earlier this year, Disney criticized the Disney company in an op-ed in The Washington Post, calling attention to Chief Executive Bob Iger’s compensation last year of $65 million, which amounts to more than 1,400 times the median pay of a Disney worker.

In addition to those named above, the letter is also signed by: Louise J. Bowditch, Robert S. Bowditch, Sean Eldridge, Stephen R. English, Agnes Gund, Catherine Gund, Nick Hanauer, Arnold Hiatt, Molly Munger, Justin Rosenstein, Stephen M. Silberstein, Ian T. Simmons, Liesel Pritzker Simmons, Alexander Soros and Anonymous.