; and (2) subject to subsection (b)(1), require, by subpoena or otherwise, the attendance and testimony of such witnesses and the production of such books, records, correspondence, memoranda, papers, and documents, as the Commission or such designated subcommittee or designated member may determine advisable. (b) Subpoenas (1) Issuance (A) In general A subpoena may be issued under this subsection only— (i) by the agreement of the chair and vice chair