I believe it is possible to build a bomb with 60% enriched Uranium , although the bomb may not be as powerful as one built with 90% enriched Uranium.
The Uranium that Iran has, is 60% enriched, so Trump has a problem, will he do a deal that everyone can live with, or will just dig a deeper hole for himself .
Before Trump and Netanyahu decided to attack Iran, I was of the opinion that the Iranians would mad to build a nuclear bomb, as it would give Israel/America an excuse to destroy Iran.
However with hindsight, that opinion may been wrong.