If it wasn't for their nuclear program for energy and medical uses they would make something else up. They already are lying about their nuclear program claiming they are working on nuclear weapons development when even the UN inspectors see no evidence of that whatsoever, just like they saw no evidence of WMD in Iraq. Iraq couldn't have gave up their WMD because they had none to give up. It is the same situation with Iran. Israel wants war with Iran and they want the USA involved because they know they can't possibly win on their own without massive casualties. Also, they are just plain chicken shit and would rather Americans die than themselves.