; and (2) by inserting after subsection (e) the following: (f) Mandatory participation in E-Verify (1) In general Subject to paragraphs (2) and (3), all employers in the United States shall participate in E-Verify, with respect to all employees recruited, referred, or hired by such employer on or after the date that is 1 year after the date of the enactment of this subsection. (2) Use of contract labor Any employer who uses a contract, subcontract, or exchange to obtain the labor of an individual in the United States shall certify in such contract, subcontract, or exchange that the employer uses E-Verify. If such certification is not included in a contract, subcontract, or exchange, the employer shall be deemed to have violated paragraph (1). (3) Interim mandatory participation (A) In general Before the date set forth in paragraph (1), the Secretary of Homeland Security shall require any employer or class of employers to participate in E-Verify, with respect to all employees recruited, referred, or hired by such employer if the Secretary has reasonable cause to believe that the employer is or has been engaged in a material violation of section 274A of the Immigration and Nationality Act ( 8 U.S.C. 1324a ). (B) Notification Not later than 14 days before an employer or class of employers is required to begin participating in E-Verify pursuant to subparagraph (A), the Secretary shall provide such employer or class of employers with— (i) written notification of such requirement