; (II) the family members and potential sponsor of such child; and (III) the child advocate, legal counsel, Office of Refugee Resettlement case manager and Federal field specialist, and any other relevant individual charged with care provision, case management, or case coordination of the immigrant child concerned. (E) Subpoena authority Subject to the approval of the Secretary of Health and Human Services, the Ombudsperson may— (i) issue a subpoena to require the production of all information, reports, and other documentary evidence necessary to carry out the duties of the Ombudsperson; and (ii) invoke the aid of any appropriate court of the United States. (F) Reporting mechanisms (i) In general The Ombudsperson shall establish and maintain— (I) a toll-free telephone number to receive complaints and reports of matters for investigation; and (II) an email address to receive such complaints and reports. (ii) Availability The Ombudsperson shall ensure that— (I) in each facility— (aa) such telephone number is made available in a prominent, visible, and public location in a common area of the facility; and (bb) a telephone is accessible to each immigrant child; (II) such email address is made available to sponsors, Flores settlement agreement class counsel, legal services providers and child advocates who serve such immigrant children, and State-level coordinators appointed under paragraph (7) of section 235(c) of the William Wilberforce Trafficking Victims Protection Reauthorization Act of 2008 ( 8 U.S.C. 1232(c) ), as added by section 213; and (III) in each facility, such telephone number and email address are made available, in a prominent, visible, and public location in a common area of the facility, to all individuals employed, contracted, or otherwise tasked with the care and custody of children by the Secretary of Health and Human Services so that such individuals may report— (aa) any potential violation of law, policy, or standard relating to immigrant children in Federal custody