On the arms shipments, we may try lawsuits via the Leahy Law if the ethnic cleansing ramps up. The way the law is written, it actually looks at arms shipments all the way down to the granular level of individual military units. It does not say arms cannot be exported to countries engaging in war crimes, it specifically says individual military units that commit war crimes cannot receive arms. If they choose to engage in a broader campaign of organized displacement out of Gaza or starvation in places where combat has largely died down, a larger number of military units could potentially become implicated, which could maybe make a lawsuit more feasible. We’ll have to see.
Regarding AIPAC, since Citizen’s United determined that monetary donations are a form of speech, this requires either an amendment or recapture of the Supreme Court. Otherwise Americans are allowed to lobby the government for whatever they wish, even if they are doing so at the behest of a foreign government. They have to disclose that, but so long as they do, they are simply exercising their Constitutional rights as perceived by the current Supreme Court. This isn’t going away any time soon, the current law is very clear and pretty much ironclad, rooted in the Constitution itself via the Bill of Rights.
There’s around 2 million Gazans still alive. That’s a lot of ethnicity still to be cleansed if cleansing is the goal.