Protesters are organizing a march on Washington, D.C., on April 15 to protest President Trump Donald John TrumpObama calls on Senate not to fill Ginsburg's vacancy until after election Planned Parenthood: 'The fate of our rights' depends on Ginsburg replacement Progressive group to spend M in ad campaign on Supreme Court vacancy MORE and demand the release of his tax returns.

A website for the event, "The Tax March," says that the event is meant to show the Trump administration that voters care about his tax returns and want them to be released.

"On April 15th, we’re marching on Washington, D.C., and in communities across the country to show that we do care. And that we’re not going away. Tens of thousands of Americans will send a clear message to Donald Trump: The president is accountable to the American people, and he must answer to us," the website's homepage reads.

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Several organizations are partnering to create the march, including Indivisible, Public Citizen, Stand Up America and Americans for Tax Fairness.

The march's executive committee on Tuesday released seven policy principles for the event. Many of those principles relate to tax reform, which Trump and congressional Republicans have said they want to make their focus in the wake of the failure on legislation to repeal and replace ObamaCare.

The Tax March's leaders said they believe the current tax system is unfair, that people should be prioritized over corporations, that tax breaks for the rich and well-connected should be opposed and that "tax justice is economic justice."

"For decades, wealth and income have grown more and more concentrated in fewer and fewer hands," the principles document states. "What those with the most need least is another tax cut. We reject efforts to further skew the economy and the tax code away from the vast majority of working people."

Another principle stresses open government.

"Government must function in an accountable and ethical manner for the public to have faith in our elected officials," the Tax March leaders said. "We need transparency and strong safeguards against corruption to ensure that the president, administration officials, and Congress are free from wrongdoing and conflicts of interest."

The date for the planned march is traditionally Tax Day, though the deadline for filing taxes has been pushed back this year to April 18 because the 15th is a Saturday. Other marches are also planned on April 15 in countries including Germany, Japan and the United Kingdom.

--Naomi Jagoda contributed to this report, which was updated at 1:30 p.m.