MSNBC host Rachel Maddow tweeted that the network will be revealing President Trump's tax returns on Tuesday night.

"We've got Trump tax returns," Maddow tweeted. "(Seriously.)"

BREAKING: We've got Trump tax returns. Tonight, 9pm ET. MSNBC.



(Seriously). — Rachel Maddow MSNBC (@maddow) March 14, 2017

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Maddow later tweeted that she has Trump's 1040 form from 2005. It is unclear from Maddow's post how the network obtained the documents.

What we've got is from 2005... the President's 1040 form... details to come tonight 9PM ET, MSNBC. — Rachel Maddow MSNBC (@maddow) March 15, 2017

MSNBC's Lawrence O'Donnell tweeted that following Maddow's 9 p.m. Eastern show, she will join him on "The Last Word." O'Donnell called it "the night we've been waiting for."

Yes seriously! I will be watching, then Rachel will join @TheLastWord at 10pm. This is the night we've been waiting for. https://t.co/NWjPDzxSqv — Lawrence O'Donnell (@Lawrence) March 14, 2017

Trump's biographer David Cay Johnston tweeted that he would be joining the shows to break the news.

On @maddow I'll break a big story about Trump and his taxes - 9PM eastern via @DCReportMedia Ill be on @lawrence, too. — David Cay Johnston (@DavidCayJ) March 15, 2017

Trump is the first president in decades to not publicly release his tax returns.

Trump has previously said he would not release them while he is being audited by the IRS, but the IRS has noted that an audit would not prevent anyone from releasing the information on their own.

Democrats have been calling for the returns, which Trump's critics believe may show suspect financial ties, particularly to Russia.

— Updated at 8:28 p.m.