Enlarge / President Joe Biden receiving a third dose of the Pfizer/BioNTech COVID-19 vaccine in the White House September 27, 2021. (credit: Getty Images | Anna Moneymaker )

President Biden's vaccine mandate is being challenged in a lawsuit filed by four active-duty US Air Force officers, a Secret Service agent, a Border Patrol agent, and four other federal employees or contractors. The lawsuit claimed that "convicted serial killers who have been sentenced to death receive more respect" than citizens who are required to take vaccines.

The lawsuit alleges that the vaccine mandate forces service members, federal employees, and federal employees to "inject themselves with: (1) a non-FDA approved product; (2) against their will; and (3) without informed consent." Plaintiffs seek a ruling that the vaccine mandates issued by Biden and the Department of Defense "violate the Fifth Amendment's guarantee of substantive due process" and "the equal protection component of the Fifth Amendment."

Plaintiffs also claim the mandate violates the Free Exercise and Establishment clauses of the First Amendment, the Religious Freedom Restoration Act, and other US laws including "Title VII of the Civil Rights Act of 1964 by discriminating against Plaintiffs and service members, federal employees, and federal contractors on the basis of their religion or disability." Biden's order does allow exceptions for medical or religious reasons but exemptions reportedly may be difficult to obtain .