Is there someone in Congress, who is not an American citizen?

1. Constitutional gatekeeper: citizenship is a written requirement

Article I of the Constitution sets explicit citizenship thresholds: seven years for the House and nine years for the Senate, and members must be inhabitants of the state they represent when elected — a textual bar that Congress has treated as a firm qualification for seating members ^{[1] [2]}. Justia’s Constitutional annotation notes that the age and citizenship qualifications are enforced at swearing‑in, meaning a Member‑elect must meet the citizenship term by the time they are to be sworn ^[1].

2. Foreign‑born does not equal non‑citizen: many members were born abroad but became U.S. citizens

Analyses of the 119th Congress show a sizable cohort of members who are foreign‑born or children of immigrants, but those counts reflect members who acquired U.S. citizenship by birth to citizen parents, derivation, or naturalization — not members who are non‑citizens serving in office ^{[3] [5]}. Pew’s count — “at least 80 lawmakers are foreign born or have at least one parent who was born in another country” — underscores immigrant backgrounds but relies on biographical indications of lawful U.S. citizenship, not on the presence of non‑citizen members ^[3].

3. Official directories and historical listings focus on birthplace, not current citizenship status

Congressional Research Service and Library of Congress profiles document birthplace, military service and other demographics of the 119th Congress; they reiterate the constitutional citizenship requirements and list foreign‑born members as naturalized or U.S. citizens derived through parents, rather than identifying any non‑citizen serving members ^[4]. The Senate’s biographical directory separately lists senators born outside the U.S. and explains the constitutional citizenship length required to qualify — reinforcing that foreign birth is compatible with service only if U.S. citizenship requirements are satisfied ^[6].

4. Recent policy proposals reflect political concern about dual loyalties, not evidence of non‑citizen members

News coverage of a 2025 proposal to ban dual citizens from serving in Congress frames a political effort to tighten eligibility and address perceived loyalty issues; that proposal assumes members are U.S. citizens but may hold other nationalities, and it does not claim that non‑citizens currently sit in Congress ^[7]. The Times of India’s summary of the proposal emphasizes future disqualification of dual nationals and renunciation requirements for current dual‑citizen members seeking reelection, but it does not document any sitting non‑citizen member ^[7].

5. What the available reporting does not say — and why that matters

Available sources do not mention any sitting member of Congress who is not a U.S. citizen; instead they document foreign‑born members who meet constitutional citizenship requirements ^{[3] [4] [5]}. Because the Constitution and congressional practice treat citizenship status as a precondition for being sworn, findings of foreign birth or dual citizenship are discussed separately from the distinct question of non‑citizen membership ^{[1] [6]}.

6. Competing viewpoints and potential agendas to watch

Advocates for stricter bans on dual nationals (as in the 2025 bill cited) frame the issue as protecting national allegiance and preventing conflicts of interest; opponents might view such measures as exclusionary toward naturalized Americans or as politically targeted measures ^[7]. News outlets and partisan actors sometimes conflate “foreign‑born” with “non‑citizen” in rhetoric — an implicit agenda that can mislead readers — but the sources used here distinguish birthplace, citizenship status, and dual nationality in legal and biographical terms ^{[7] [3] [4]}.

7. Bottom line for your original question

Under the Constitution and in available reporting, someone who is not a U.S. citizen cannot serve in Congress because Representatives and Senators must have been U.S. citizens for seven and nine years respectively by the time they take office ^{[1] [2]}. Available sources do not identify any current member who is not a U.S. citizen; they document foreign‑born and naturalized members who meet the constitutional requirements ^{[3] [4] [5]}.

Limitations: this answer relies exclusively on the supplied documents and their scope; if you want verification of any individual member’s current citizenship or pending eligibility challenges, that detail is not provided in the cited materials and would require additional, member‑specific reporting or official disclosures (not found in current reporting).