; and (2) the extent to which any part of the Government of Mexico has refused to work with the United States, or otherwise obstructed, paused, or unnecessarily delayed bilateral security cooperation with respect to disrupting the flow of fentanyl and its precursor chemicals. (f) United States death toll as chief monitoring and evaluation metric (1) Metrics to evaluate efforts The Office of Knowledge Management of the Bureau of International Narcotics and Law Enforcement Affairs shall use monthly and yearly statistics indicating the number of United States citizens who die from the consumption or ingestion of fentanyl and other illicit narcotics— (A) as the primary monitoring and evaluation metric of the efforts led by such bureau in Mexico