For years, Trump has been moving the mark on when he’ll release his tax returns. First, he was going to release them if he ran for office. Then, he promised we’d see them once the IRS finished its audit. Finally, in January, Kellyanne Conway dropped the pretense and said he’ll never release them, arguing that his win in November means Americans must not care about them.

The trouble is, Conway has it exactly backwards: It is precisely because Trump won in November that people care about his tax returns.

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The president’s tax returns will give us definitive answers about his ties to Russia. Trump has a long and troubling record of defending the Kremlin, praising Vladimir Putin, and doing business with Russian oligarchs. Earlier this month, a Reuters investigation found that “at least 63 individuals with Russian passports or addresses have bought at least $98.4 million worth of property in seven Trump-branded luxury towers in southern Florida.” Donald Trump Jr. has even admitted that Trump Organization businesses “see a lot of money pouring in from Russia.” Only by revealing Trump’s full tax returns will we know if Trump is bought and paid for by Russia — and compromising our national security from the Oval Office.

The potential conflicts of interest go beyond just Russia. With Congress preparing to rewrite the tax code, President Trump could use tax reform as a vehicle to slash taxes for himself and the Trump Organization while cutting critical investments in our schools and neighborhoods. If he is going to propose reforms to the tax system, he needs to release his own taxes first. That is the only way Americans can know if he is pushing policies — including tax cuts — that will benefit himself, his Goldman Sachs cabinet, and super rich friends.

For decades, corporations, Wall Street, and CEOs like Trump have exploited loophole after loophole to cut down on their tax bill. Now, Trump, Paul Ryan, and Mitch McConnell are going even further by proposing dramatic tax cuts for corporations and the wealthiest Americans, at the expense of critical programs like Meals on Wheels, food stamps, and FEMA.

Instead of slashing taxes for billionaires, a serious tax reform plan will fix the gross injustices in the tax code and build a fairer, more equitable system that closes loopholes, invests in communities, and puts more money in the hands of working Americans.

That’s why Americans are marching tomorrow. They’re standing against a president who has flirted with corruption, and sending a message to our representatives in Washington: It is time to start defending our country’s long tradition of open and ethical government.

Trump needs to come clean with the American people and release his tax returns. In our American democracy, We the People are Trump’s boss. He works for us. And we will not tolerate his dangerous attack on our country’s democratic principles of transparency and accountability.