President Trump Donald John TrumpSteele Dossier sub-source was subject of FBI counterintelligence probe Pelosi slams Trump executive order on pre-existing conditions: It 'isn't worth the paper it's signed on' Trump 'no longer angry' at Romney because of Supreme Court stance MORE’s onetime business associate Felix Sater was interviewed privately by House Intelligence Committee staff Tuesday about his years-long business relationship with President Trump and failed efforts to build a Trump Tower in Moscow during the 2016 campaign.

Sater spent nearly eight hours behind closed doors with committee staff, telling reporters later that he spoke truthfully about his knowledge of the discussions to pursue the Trump Tower Moscow project during the 2016 presidential campaign and answered all of the questions posed by congressional investigators.

But the committee issued a rare statement Tuesday evening vehemently pushing back on Sater’s suggestion he was fully cooperative, saying he still has not provided documents including unredacted telephone records and files related to a joint defense agreement that the committee required he produce under subpoena.

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“Mr. Sater has not fully cooperated with the Committee, and he will remain under subpoena until he does so,” House Intelligence Committee spokesman Patrick Boland said in a statement.

Boland also said Sater asserted “a baseless claim of attorney-client privilege” in response to a question about former Trump attorney Michael Cohen Michael Dean CohenJudge orders Eric Trump to comply with New York AG's subpoena before Election Day A huge deal for campaign disclosure: Trump's tax records for Biden's medical records Our Constitution is under attack by Attorney General William Barr MORE’s false statement to Congress about the property discussions in summer 2017.

“Our investigation thus far has revealed that Sater was not a part of any joint defense agreement, and has no basis to assert this privilege over these documents,” Boland said.

Sater downplayed the importance of the real estate deal when questioned by reporters following the marathon session, saying it was “no different” than the dozen other Trump Tower projects he pursued domestically and internationally in the course of his years working with Trump.

“In hindsight, I should have probably tried to revive Trump Paris. A lot less questions,” Sater quipped.

The House Intelligence Committee sought Sater’s testimony as part of the panel’s sweeping investigation into Trump’s financial dealings and ties to Russia, a probe unveiled by Chairman Adam Schiff Adam Bennett SchiffSchiff claims DHS is blocking whistleblower's access to records before testimony GOP lawmakers distance themselves from Trump comments on transfer of power Rubio on peaceful transfer of power: 'We will have a legitimate & fair election' MORE (D-Calif.) in the weeks before former special counsel Robert Mueller Robert (Bob) MuellerCNN's Toobin warns McCabe is in 'perilous condition' with emboldened Trump CNN anchor rips Trump over Stone while evoking Clinton-Lynch tarmac meeting The Hill's 12:30 Report: New Hampshire fallout MORE concluded his investigation into Russia's election interference.

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Sater, who cooperated extensively in Mueller’s investigation, is a key person of interest for House Democrats because of his efforts with Cohen to bring a Trump property to Moscow.

Schiff has raised national security concerns about the defunct business proposal, noting that the Trump Organization was pursuing the project at a time when then-candidate Trump was speaking positively about Russian President Vladimir Putin Vladimir Vladimirovich PutinPutin nominated for Nobel Peace Prize Navalny released from hospital after suspected poisoning Ex-Trump national security adviser says US leaders 'making it easy for Putin' to meddle MORE on the campaign trail. Trump signed a letter of intent to pursue the project but never went through with the plans.

“This was a deal that he was seeking the Kremlin's help to make happen — a deal that Michael Cohen believed, and others as well, that without Putin's support they could not make happen,” Schiff said during an appearance at the National Press Club in June.

“That may not be a crime. Maybe it should be, but it may not be a crime. It is however, a counterintelligence problem of the first order of magnitude,” Schiff said.

The project attracted scrutiny from Mueller’s prosecutors and Sater’s involvement in the talks is detailed in the special counsel’s 448-page report. The special counsel did not unveil charges in connection with the real-estate discussions, beyond Cohen’s guilty plea to making false statements to Congress about the duration of the talks within the Trump Organization.

Mueller also did not find sufficient evidence to charge members of the campaign with conspiring with Russia to interfere in the election.

Schiff’s panel is also examining whether attorneys working for Trump’s family obstructed the congressional investigation into Russian interference by shaping or editing Cohen’s false statement.