; (2) shall make any such waiver effective for a period not to exceed 180 days; and (3) may renew any such waiver one or more times. 5. Limitation on waiver authority under the Trade Agreements Act of 1979 Section 301 of the Trade Agreements Act of 1979 ( 19 U.S.C. 2511 ) is amended by adding at the end the following: (g) Limitation on waiver authority relating to essential medicines, medical countermeasures, and critical inputs (1) In general The authority of the President under subsection (a) to waive the application of any law, regulation, procedure, or practice regarding Government procurement does not authorize the waiver of any preferences for goods that are essential medicines, medical countermeasures, or critical inputs. (2) Definitions In this subsection, the terms essential medicines , medical countermeasures , and critical inputs — (A) have the meanings given such terms in section 3(c) of the Safe Medicine Act ; and (B) include the 227 essential medicines, medical countermeasures, and critical inputs published on October 30, 2020, by the Food and Drug Administration in accordance with Executive Order 13944. .