Israel is in a tizzy because the US has stated publicly that Israel has nuclear weapons and has called on Israel to join the NPT. This FT report is just factual, while this JTA report is more alarmist. The Israelis appear worried that the US will try to make Israel adhere to the same treaty requirements that it is trying to make Iran adhere to, in order to reign in Iran’s nuclear program. Israel does not believe it should be subject to the same regime as most other nations in the world. There are only a few holdout who refuse to join the Non-Proliferation Treaty, including North Korea, Pakistan, and India, as well as Israel.
Maybe the US was preparing for this by releasing information earlier about Israel’s nuclear capability.