Cambridge Analytica whistleblower Christopher Wylie told House Democrats that Steve Bannon, President Donald Trump's former adviser, was behind much of the company's early focus on promoting public discontent to influence U.S. elections.

"Cambridge Analytica was set up to be essentially a full-service propaganda machine," Wylie said, according to a partial transcript of Tuesday's closed-door interview released by House Democrats.

Republicans didn't participate in the interview of Wylie, conducted by Democrats on the Judiciary and the Oversight and Government Reform committees. Wylie also met on Wednesday with House Intelligence Committee Democrats. Bannon, who served as chief executive officer of Trump's campaign and later as chief White House strategist, didn't immediately respond to a request for comment.