I certainly would be! I did a search and apparently, this information is not "readily" available. I do remember hearing that Feinstein (RIP) was, and maybe Joe Lieberman ... If you have a reliable link or list, I'd appreciate it.
https://www.thelibertybeacon.com/members-in-us-politics-who-hold-dual-usisraeli-citizenship/
This is an old list; maybe a good starting point. Many are still in Congress.