(CNN) Felix Sater, the Russian-born business associate of President Donald Trump who worked on the Moscow Trump Tower project, told CNN Wednesday he will testify before the House Intelligence Committee on Friday.

Sater's testimony, which will be behind closed doors, is a sign that the House Intelligence Committee is ramping back up its investigation into the President's finances and potential foreign influence.

House Intelligence Chairman Adam Schiff confirmed that Sater was coming for a staff-led interview, and said Sater was one of several witnesses the committee would bring in connected to the Trump Tower Moscow project.

"It's not a start-up (to the investigation) because we have been doing this from the beginning of this session. We are finally getting witnesses in," Schiff said. "It's obviously quicker and easier to get witnesses in (who are) unaffiliated with the administration, since they're obstructing everything."

Sater had been scheduled to appear publicly before the committee in March, but Schiff postponed that hearing after special counsel Robert Mueller finished his report . The House Judiciary Committee also postponed a closed-door interview with Sater that has not been rescheduled.

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