israel is a sovereign country with absolute authority over who is and is not allowed to cross it's borders. they're fully in their rights. that said, i would hope that the openly racist representatives in question are afforded the opportunity to appeal the decision via the israeli judiciary, and are otherwise given proper due process in law. i would also hope that this kind of rash and poorly thought through kneejerk punitive reactionary policy is not reflective of how sanders would behave as commander in chief.

that said, i would take the opposite position: if israel insists on interfering in american politics, perhaps there should be a serious discussion about statehood. i don't want to be the 51st state. israel is a better choice.

https://www.commondreams.org/news/2019/08/16/sanders-says-if-israel-wants-ban-members-congress-it-should-not-receive-billions-us