Read the article. More there than everyone here seems to think.
The committee also authorized subpoenas for Sidney Blumenthal, former Obama chief of staff Denis McDonough, former FBI counsel Lisa Page, former FBI agent Joe Pientka, former ambassador to the United Nations Samantha Power, former FBI director of counterintelligence Bill Priestap, former White House national security adviser Susan Rice, former FBI agent Peter Strzok, former FBI lawyer Kevin Clinesmith