Brave Search: https://search.brave.com/ask?q=How+many+congresspersons+hold+dual+citizenship%2C+and+from+what+countries&conversation=08970033f2a36a8c511323cb44e9f8b6bcae

FYI: Claims that 89% of Senators or Congress members hold dual citizenship with Israel are false and have been widely debunked. These claims often stem from conspiracy theories and misinterpretations of Israel’s Law of Return, which allows Jews to immigrate (as well as Righteous Gentiles, eg. those who aided the escape of Jews from Hitler, and their descendants) but does not automatically confer citizenship. Citizenship requires formal application and intent to reside in Israel!

Senate: Potentially Have, or could have-

Ted Cruz - Canada (He renounced Canadian Citizenship however, so probably should not be on this list!)

Senator Michael Bennet (D-CO): Born in India to an American father and British mother. He may hold British citizenship by descent.

Senator Tammy Duckworth (D-IL): Born in Thailand to an American father and Thai mother. She likely held Thai citizenship at birth.

Representative Michelle Bachmann had Swiss Citizenship, which she renounced.

Representative Victoria Spartz (R-IN): Born in the Ukrainian SSR (now Ukraine). She became a U.S. citizen in 2000 and may retain Ukrainian citizenship, though Ukraine generally restricts dual citizenship.

Representative Diana DeGette (D-CO): Born in Japan to American parents. While she is a U.S. citizen by birth, Japan does not automatically grant citizenship by birthplace, so dual citizenship is unlikely in this case.

https://www.foreignpolicyjournal.com/2018/12/10/dual-citizens-in-congress-we-need-to-know/

https://www.jewishvirtuallibrary.org/jewish-members-of-the-119th-congress