A whistleblower told a U.S. Senate panel on Wednesday that data analytics firm Cambridge Analytica, which accessed data from millions of Facebook users, also broke into computer systems to get access to information and mined data to discourage voters, particularly African-Americans, from participating in elections.

Christopher Wylie, a research director at Cambridge Analytica from 2013 to 2014, told members of the Senate Judiciary Committee that the firm, co-founded by Steve Bannon, who was campaign manager and later a top White House strategist for President Donald Trump, came up with phrases like “drain the swamp” that became key campaign themes and slogans.