Tom Barrack, who chaired President Trump Donald John TrumpOmar fires back at Trump over rally remarks: 'This is my country' Pelosi: Trump hurrying to fill SCOTUS seat so he can repeal ObamaCare Trump mocks Biden appearance, mask use ahead of first debate MORE's inaugural committee, indicated Tuesday he intends to cooperate with document requests from House Democrats investigating the president's administration, campaign and business.

A spokesman for Barrack told CNBC in an email that the investor "will fully cooperate with the Committee’s important work as he has with all government inquiries."

Barrack, whose relationship with Trump dates back years, is one of 81 individuals and entities that the House Judiciary Committee served with document requests on Monday as part of its sprawling investigation that will focus on obstruction of justice, public corruption and abuses of power.

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The Judiciary Committee asked Barrack to turn over documents related to Trump campaign or transition contacts with Russia, the United Arab Emirates, Qatar or Saudi Arabia; any foreign government discussing an emolument to Trump or his family business after the 2016 election; and any loan or financing in Trump’s business from Russia or Russian nationals since 2015.

Committee Chairman Jerrold Nadler (D-N.Y.) announced the investigation and related document requests on Monday, prompting a fierce response from the White House.

Trump blasted Nadler on Tuesday morning, accusing him of harassing those on the list of document requests and other Democratic committee chairmen as going "stone cold Crazy."

White House press secretary Sarah Huckabee Sanders on Monday night criticized Democrats over the investigation into Trump, calling the probe a "disgraceful and abusive investigation" and an effort to "distract" from the party's agenda.

Nadler has defended his committee's investigation, saying it falls under Congress's oversight responsibilities and arguing that Republicans abdicated that role for the past two years.

Former White House press secretary Sean Spicer Sean Michael SpicerKellyanne Conway to leave White House at end of month Pro-Trump duo Diamond and Silk launch new program on Newsmax TV The Hill's 12:30 Report - Presented by Facebook - Supreme Court's unanimous decision on the Electoral College MORE said Tuesday that he plans to cooperate with the investigation as well.