Iran "could be making nuclear warhead". A small change, but still a change in the UN usual phraseology, when it comes to Iran.
From the very technical point of view, you do not need too many sentences and diplomatic words to identify how much enriched uranium do you need in order to produce atomic bombs. From the political point of view, you do not need to many imagination to conclude how such a capability could be used by a non-democratic country.
Read my lips? And nothing than my lips?