Call or write to your U.S. Congressman or Congresswoman.
Find them here: http://www.house.gov/representatives/find-your-representative or search online to find their snail mail address and send a letter.
Template:
I’m researching information about members of Congress with dual citizenship for a Constituency News piece. This is an official request for a response in writing regarding whether Congressman/woman [Insert Name] has dual citizenship with any country in addition to the United States of America. If “yes” please also specify the names of the countries with which citizenship is shared.
Thank you. I look forward to your official response.
Additional Information:
H.R.6090 – Antisemitism Awareness Act of 2023 https://www.congress.gov/118/bills/hr6090/BILLS-118hr6090ih.pdf
U.S. House Of Representatives Member Profiles: https://clerk.house.gov/Members#MemberProfiles