; and (B) beginning 1 year after the date of the enactment of this Act, not fewer than 1 convening per quarter to receive testimony each calendar year until the date on which the Commission submits the final report of the Commission under section 111(e)(3). (4) Opportunity to provide testimony No person or entity shall be denied the opportunity to provide relevant testimony at a convenings held under this subsection, subject to the discretion of the Chairperson of the Commission (or a designee). (i) Subpoenas (1) In general (A) Issuance of subpoenas (i) In general If a person fails to supply information requested by the Commission, the Commission may issue, on a unanimous vote of the Commission, a subpoena requiring from a person the production of any written or recorded evidence necessary to carry out the duties of the Commission under section 111. (ii) Notification (I) In general Not later than 10 days before the date on which the Commission issues a subpoena under clause (i), the Commission shall submit to the Attorney General a confidential, written notice of the intent to issue the subpoena. (II) Subpoena prohibited by attorney general (aa) In general The Attorney General, on receiving a notice under subclause (I), may, on a showing of a procedural or substantive defect, and after the Commission has a reasonable opportunity to cure, prohibit the issuance of the applicable subpoena described in that notice. (bb) Notification to congress On prohibition of the issuance of a subpoena under item (aa), the Attorney General shall submit to Congress a report detailing the reasons for that prohibition. (B) Production of evidence The production of evidence may be required from any place within the United States. (2) Failure to obey a subpoena (A) Order from a district court of the united states If a person does not obey a subpoena issued under paragraph (1), the Commission is authorized to apply to a district court of the United States described in subparagraph (B) for an order requiring that person to comply with the