The judgement of the US intelligence community and others in the government is that Iran does not have a current nuclear weapons program.
Also, they don't have missiles that can reach the US and aren't likely to for several years at the earliest. Israel pulled this one out of their, um, hat this week to try to drum up support for - what? Even more sanctions? War? Dan Murphy points out that this kind of talk has been around for some time, and, say it again, Iran doesn't present a danger to the United States.