Senate Judiciary Chairman Lindsey Graham has announced he’ll seek the authority to subpoena numerous former officials including ex-FBI Director James Comey, former CIA Director John Brennan and former Director of National Intelligence James Clapper as part of his panel’s review of the Russia investigation.

Graham, a close ally of U.S. President Donald Trump, plans a committee vote to authorize subpoenas for witnesses and documents as he reviews the conduct of the inquiry known as Crossfire Hurricane and officials’ use of the Foreign Intelligence Surveillance Act.

In addition to Comey, Clapper and Brennan, Graham also wants authority to call Comey’s former deputy Andrew McCabe, former Attorney General Loretta Lynch, former acting Attorney General Sally Yates and dozens of others.