Biden v. Missouri
The Supreme Court allowed the federal government's COVID-19 vaccine mandate for healthcare workers at Medicare and Medicaid facilities to take effect, ruling the Health Secretary had clear authority to impose it under the laws governing those programs.
The decision cleared the way for the rule to apply to roughly 10 million healthcare workers while legal challenges continued in lower courts. Four dissenters argued Congress had never clearly authorized such a sweeping federal vaccine requirement.
How it got here: District courts in Missouri and Louisiana blocked the mandate; the Fifth and Eighth Circuits refused to stay those blocks; the federal government applied directly to the Supreme Court for emergency stays.
The Case in Depth
What happened
The Secretary of Health and Human Services issued a rule in November 2021 requiring that staff at hospitals, nursing homes, and other facilities participating in Medicare and Medicaid be vaccinated against COVID-19, with exemptions for medical or religious reasons. The rule covered roughly 10 million workers. The Secretary concluded that unvaccinated healthcare workers posed a serious risk of spreading COVID-19 to the elderly, disabled, and low-income patients these programs serve. Two groups of states sued, and federal district courts in Missouri and Louisiana blocked the rule.
The question before the Court
Could the federal Health Secretary require workers at Medicare and Medicaid facilities to get COVID-19 vaccines as a condition of those facilities receiving federal funding — using his existing statutory power to set health and safety conditions for program participation?
The Court's answer
Yes — the Court ruled that the Health Secretary was likely acting within his legal authority and granted emergency orders putting the vaccine mandate into effect while the legal challenges continued.
The Court reasoned that Congress had expressly authorized the Secretary to impose conditions on Medicare and Medicaid facilities that he "finds necessary in the interest of the health and safety" of patients. Requiring healthcare workers to be vaccinated against a deadly, highly contagious virus fits squarely within that grant of power. The Secretary's rule was also consistent with the agency's long history of imposing detailed infection-control requirements, and vaccination mandates are already a standard feature of healthcare employment across the country. The Court also rejected arguments that the rule was arbitrary, that the agency lacked good cause to skip notice-and-comment procedures, and that other statutory provisions blocked the mandate.
Curious how the Court got there? See the step-by-step legal reasoning →
Why it matters
Healthcare workers at hospitals, nursing homes, and other facilities that take Medicare or Medicaid money faced an immediate choice: get vaccinated or risk their employers losing federal funding — and potentially losing their jobs. Facilities that refused to enforce the mandate faced fines and loss of participation in the programs. The order was temporary and the underlying lawsuits remained live.
What changes now
With the injunctions stayed, the vaccine mandate immediately took effect for healthcare workers at Medicare and Medicaid facilities. The legal challenges were not decided — they returned to the Fifth and Eighth Circuits for further argument. The Supreme Court's stay would terminate automatically if the government chose not to seek full Supreme Court review, or would remain in place if it did. This order resolved only whether the mandate could take effect during the appeals, not whether it was ultimately lawful.
What this does not decide
The Court did not decide whether the vaccine mandate is ultimately lawful — only that the government was likely to prevail and that the mandate could take effect while lower court appeals continued. The underlying cases remained open, and a later ruling could still strike down the mandate.
Concurrences and dissents
Dissent — Justice Thomas
“These cases are not about the efficacy or importance of COVID–19 vaccines. They are only about whether CMS has the statutory authority to force healthcare workers, by coercing their employers, to undergo a medical procedure they do not want and cannot undo.”Justice Thomas framing the dissent's central objection as a question of statutory authority, not vaccine policy.
Justice Thomas argued the government had not made the strong showing of likely success on the merits required for a stay. In his view, the scattered and largely definitional statutory provisions the government relied on did not clearly authorize a nationwide vaccine mandate covering 10 million workers. He applied the principle that Congress must speak clearly before authorizing actions of vast economic and political significance — especially ones that traditionally belong to states' authority over public health — and concluded Congress had not done so here.
Dissent — Justice Alito
Justice Alito joined Justice Thomas's dissent and wrote separately to emphasize a procedural objection: even if the government had the authority to mandate vaccination, it did not follow the required public notice-and-comment process and failed to show genuine 'good cause' for skipping it. He noted that vaccines had been available for ten months before the rule and that the agency's own delays contradicted its claimed urgency. He warned the Court's ruling would embolden future agencies to bypass procedural safeguards and regulate first, listen later.
How the Court got there
The legal reasoning, step by step
- To decide whether to grant an emergency stay, the Court applied a four-factor test: Is the government likely to win on the merits? Will irreparable harm result without a stay? Will the other side be seriously harmed if the stay is granted? Where does the public interest lie? The case turned mostly on whether the government could make a strong showing on the merits.
- The Court read Congress's authorization for the Secretary to impose conditions 'necessary in the interest of the health and safety of individuals who are furnished services' in facilities as clearly broad enough to cover a vaccine mandate. COVID-19 is highly contagious and especially dangerous to the elderly, disabled, and low-income patients that Medicare and Medicaid serve.
- The Court pointed to the Secretary's long-standing practice of imposing detailed health-and-safety conditions on facilities — including infection prevention and control programs, staff training requirements, and personnel qualifications — as confirmation that the rule fell within his recognized authority, not as an unprecedented power grab.
- On the arbitrary-and-capricious challenge — the legal standard asking whether an agency reasonably considered the relevant evidence — the Court found the Secretary had adequately explained his choices, including why a vaccine mandate was preferable to testing, why workers with prior COVID-19 illness were still covered, and why staffing-shortage concerns were addressed.
- The Court rejected the argument that the Secretary lacked 'good cause' (the legal standard for bypassing the usual public-notice-and-comment process). The Secretary's specific finding that winter flu season and the Delta variant made further delay dangerous was enough to satisfy that standard.
- The Court closed with a principle that captured the holding: a global pandemic cannot expand an agency's powers beyond what Congress granted, but it also cannot shrink powers the agency legitimately holds. Because the Secretary's vaccine mandate fell within his recognized authority, the injunctions blocking it were stayed.