; or (II) choose to repay such loan pursuant to a plan described in clause (i) or (ii) of subparagraph (A). (ii) Other existing borrowers With respect to a borrower who, as of the day before the date of enactment of FAIR Act , was repaying a loan made under this part pursuant to a plan described in subparagraph (D) or (E) of paragraph (1), the Secretary shall, pursuant to section 494A(b), enroll such borrower into the income-driven repayment assistance plan under section 494A. (F) Prohibition Except as provided in subparagraph (E), the Secretary may not— (i) authorize a borrower of a loan made under this part to repay such loan pursuant to a repayment plan that is not described in clause (i) or (ii) of subparagraph (A); or (ii) carry out or modify a repayment plan that is not described in such clause (i) or (ii). . (b) FFEL Loans Section 428(b)(9) is amended— (1) in subparagraph (A)— (A) in clause (iv), by striking and at the end; (B) in clause (v), by striking the period at the end and inserting ; and ; (C) by adding at the end the following: (vi) for any borrower repaying, on or after July 1, 2023, a loan made, insured, or guaranteed under this part— (I) in the case of a borrower who, as of the day before the date of enactment of FAIR Act , was repaying such loan pursuant to a plan described in clause (i), (ii), (iii), or (iv), continuing to repay such loan pursuant to such plan; or (II) (aa) an income-driven repayment assistance plan under section 494A; or (bb) the standard repayment plan described in clause (i).