Washington (CNN) Sen. Kirsten Gillibrand disclosed her 2018 tax return on Wednesday and called on her 2020 Democratic presidential rivals to follow suit.

"I think transparency and accountability is so important in government," Gillibrand, a New York Democrat, told CNN's Alisyn Camerota on "New Day" on Wednesday. "And I think the American people have a right to know, particularly people who are running for president and are president today, who has not disclosed his tax returns."

"It allows people to know you're working for them and nobody else," she added.

Gillibrand is the first 2020 presidential candidate to disclose her 2018 tax return as Democrats have lambasted President Donald Trump for withholding his. In 2016, Trump broke with decades of tradition and refused to release his tax returns, claiming he was under Internal Revenue Service audit. Trump's decision to forgo releasing his tax returns has incensed Democrats and ethics watchdogs, who accuse the President of hiding his assets that could indicate conflicts of interest.

"And now, as we fight to defeat Donald Trump, we need honesty, transparency and accountability more than ever. That's why Kirsten has posted her tax returns from the last 12 years here for all to see. And she's calling on every candidate in the Democratic field to follow her lead and release theirs, too," her campaign website reads, along with links to her past tax returns dating back to 2007.

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