; or (ii) be considered to have issued such certification on the 21st day after receipt of the petition. (4) Even after the Secretary issues such a certification for a group of workers at a firm under paragraph (3)(C), the Secretary may conduct an investigation under subsection (a)(3) of that section 221 to identify additional groups of workers who may be eligible for benefits under this chapter. (f) Notification of downstream producers and suppliers On certification of a group of workers as described in subsection (e)(3)(C), the Secretary, in conjunction with the State in which the site of employment involved is located, shall— (1) endeavor to identify downstream producers and suppliers as defined in section 222(c) of the Trade Act of 1974 ( 19 U.S.C. 2272(c) ) that are potentially impacted by the plant closing or mass layoff involved; (2) provide to such producers and suppliers— (A) concerning benefits available under chapter 2 of title II of the Trade Act of 1974 ( 19 U.S.C. 2271 et seq.), a description of the benefits, of the means for filing a petition and applying for such benefits, and of the availability of assistance in filing the petition; and (B) concerning benefits available under chapter 3 of that title ( 19 U.S.C. 2341 et seq.), the description specified in subparagraph (A); and (3) direct the producers and suppliers to provide to their workers the description specified in paragraph (2)(A), concerning benefits described in paragraph (2)(A). (g) State transmittal of notices Each State that receives 1 or more notices described in subsection (a)(2) during a calendar quarter shall, not later than 10 days after the end of the quarter, transmit the notices to the Secretary. . (d) Administrative enforcement and database Section 5 of the Worker Adjustment and Retraining Notification Act ( 29 U.S.C. 2014 ) is amended— (1) by redesignating subsection (b) as subsection (d)