Representative Ellison asks, “…if Israel hits them [Iran], are we going to be dragged into backing up Israel once they come under attack, under our mutual defense pact? ”
I think the Congressman is mistaken. I can find no evidence that the United States has a mutual defense pact with Israel.
The U.S. Department of State maintains a web page listing our nation’s collective defense arrangements. There are seven. Israel is not a party to any of the seven.
The Jewish Virtual Library lists over 120 formal agreements between the U.S. and Israel. Only two are treaties: a treaty of friendship and a treaty on mutual assistance in criminal matters. I cannot find a mutual defense pact between the U. S. and Israel on that extensive list.
Mondoweiss has commenters who are well-informed about international agreements. I hope someone like Hostage is reading and will chime in. I believe that, legally speaking, it is incorrect to refer to Israel as an ally without a mutual defense treaty.