According to the nuclear nonproliferation treaty, which US signed, it's not allowed to supply foreign aid to a country with nuclear weapon which has not also signed the treaty. Israel has not signed the treaty, and has nuclear weapons. Here's a summary from [The Unz Review article](https://www.unz.com/pgiraldi/does-israel-permit-freedom-of-worship/): >Israel’s power over the US government is such that no American official will confirm that the Israelis have, and have had for years, a secret nuclear arsenal consisting of as many as 200 nukes. The situation is particularly odd in that the United States is on record as being strongly opposed to nuclear proliferation, except for Israel, and the enriched uranium that was used to create Israel’s bombs as well as the nuclear triggers were stolen and exported illegally from the US. Former Israeli Prime Minister Benjamin Netanyahu himself was reportedly involved in the thefts. One lawyer friend has suggested that the reason for the reticence is that under US law by way of the Symington Amendment, no assistance or aid can be given to any country that has not signed the Nuclear Non-Proliferation Treaty (NPT). Israel has not signed and also has a widely acknowledged nuclear arsenal. To preserve Israel’s billions of dollars in annual largesse from the US taxpayer, silence over what goes on when the government breaks its own laws must be maintained. Some might consider that a case of pandering to Israel rather than taking steps to enhance United States security, but when it comes to the Jewish state that argument is a non-starter in Washington as Israel always comes first.