The Senate Intelligence Committee is interviewing a former business associate of President Trump Donald John TrumpBubba Wallace to be driver of Michael Jordan, Denny Hamlin NASCAR team Graham: GOP will confirm Trump's Supreme Court nominee before the election Southwest Airlines, unions call for six-month extension of government aid MORE, who once sought to help broker a deal for the real estate mogul in Moscow.

BuzzFeed News reported that Felix Sater was seen entering the committee's secure office spaces on Wednesday.

Sater has previously met with 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, as well as the House Intelligence Committee. He acknowledged in a statement to the House committee in December that he worked as an asset to multiple U.S. national security, intelligence and law enforcement agencies.

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His interview with the Senate Intelligence Committee comes as part of the panel's investigation into Russia's role in the 2016 presidential election and whether the Trump campaign conspired with Moscow to swing the race in the president's favor, according to BuzzFeed News.

Sater was reportedly behind an effort to help broker a deal to build a Trump Tower in Moscow. His involvement in that proposed project is likely to be a key focus of the committee interview, BuzzFeed News reported.

In a 2015 letter to Trump's personal lawyer Michael Cohen, Sater proposed building a Trump Tower in Moscow and vowed to win the Kremlin's support for the project.

"I will get all of Putin's team to buy in on this, I will manage this process," he wrote at the time.

Sater also met with Cohen during the campaign about a plan to quell tensions between Ukraine and Russia. That plan involved lifting sanctions on Moscow while letting Russia keep Crimea, which it annexed in 2014.

The Senate Intelligence Committee also previously requested financial information on Sater and his real estate firm, Bayrock Group LLC, from the Treasury Department's Financial Crimes Enforcement Network (FinCEN) in December.

It is not publicly known whether FinCEN turned over records on Sater, but the agency has flagged 23 suspicious activity reports on his financial transactions, according to Buzzfeed News.