1. US Department of Health and Human Services, Centers for Disease Control and Prevention (CDC) https://www.cdc.gov/coronavirus/2019-ncov/cdcresponse/Final-CDC-Order-Prohibiting-Introduction-of-Persons.pdf (1 April 2022).
2. 42 US Code § 265 (1 July 1944).
3. Amon, J. et al. https://www.publichealth.columbia.edu/public-health-now/news/public-health-experts-urge-us-officials-withdraw-order-enabling-mass-expulsion-asylum-seekers (18 May 2020).
4. Backster, A. et al. https://www.publichealth.columbia.edu/research/program-forced-migration-and-health/letter-cdc-director-walensky-hhs-secretary-becerra-and-dhs-secretary-mayorkas-august-2021-title-42-0 (1 September 2021).
5. Dearen, J. & Burke, G. Pence ordered borders closed after CDC experts refused. Associated Press (3 October 2020).