; (C) evidence used in the investigation is obtained by lawful means and not tainted by political sources or motives; and (D) warrants sought in the investigation are supported by probable cause and in compliance with all applicable law. (2) Duration The oversight investigation shall be ongoing and continue at least until the investigation described in subsection (a) has been closed. (3) Access to materials Notwithstanding any other provision of law, the Attorney General shall make available to the Inspector General for the Department of Justice any materials that are relevant to the investigation described in subsection (a). The Inspector General, in consultation with the Attorney General, shall ensure appropriate procedures to safeguard any intelligence and counterintelligence materials or other materials the disclosure of which would constitute a threat to national security. (4) Rule of construction For the purpose of carrying out this subsection, section 8E(a)(1)(A) of the Inspector General Act of 1978 (5 U.S.C. App.) shall not apply. (c) Inspector general notice of investigation and report (1) Notice of investigation (A) In general Upon opening of the investigation described in subsection (b), the Inspector General shall notify each of the following individuals that an oversight investigation subject to this Act has commenced and that a report will be issued at the conclusion of the Investigation pursuant to this Act: (i) The President of the United States. (ii) The Speaker of the House of Representatives. (iii) The Minority Leader of the House of Representatives. (iv) The Senate Majority Leader. (v) The Senate Minority Leader. (B) Exception Notwithstanding subparagraph (A), the Inspector General for the Department of Justice may decline to submit notice or any other information to an individual described in clauses (i), (ii), (iii), (iv), and (v) of such subparagraph if— (i) the individual is a subject of the investigation described in subsection (a)