; (C) by amending paragraph (3) to read as follows: (3) Auction (A) In general Not later than January 15, 2028, the Commission, in coordination with the Assistant Secretary, shall commence a system of competitive bidding under section 309(j) of the Communications Act of 1934 ( 47 U.S.C. 309(j) ), in accordance with paragraph (2) of this subsection, of the frequencies identified under such paragraph as suitable for a system of competitive bidding. (B) Prohibition No entity that produces or provides any covered communications equipment or service (as defined in section 9 of the Secure and Trusted Communications Networks Act of 2019 ( 47 U.S.C. 1608 )), or any affiliate (as defined in section 3 of the Communications Act of 1934 ( 47 U.S.C. 153 )) of such an entity, may participate in the system of competitive bidding required by subparagraph (A). (C) Scope The Commission may not include in the system of competitive bidding required by subparagraph (A) any frequencies that are not in the covered band. ; and (D) by amending paragraph (4) to read as follows: (4) Modification or withdrawal of Federal entity licenses (A) In general The President, acting through the Assistant Secretary, shall— (i) begin the process of modifying or withdrawing any assignment to a Federal Government station of the frequencies identified under paragraph (2) to accommodate non-Federal use, shared Federal and non-Federal use, or a combination thereof in accordance with that paragraph not later than December 15, 2027; and (ii) not later than 30 days after completing any necessary withdrawal or modification under clause (i), notify the Commission that the withdrawal or modification is complete. (B) Limitations The President may not modify or withdraw any assignment to a Federal Government station as described in subparagraph (A)— (i) unless the President determines that such modification or withdrawal will not pose an unacceptable risk to the national security of the United States