Trump knows bombing Iran's Fordo nuke site has pros and cons.  
He thinks it's needed due to weapons risk in short time.  
Sources say he feels there aren't many options left.  
He approved attack plans but hasn't decided yet.  
He's open to U.S. joining if it destroys Fordo.  
As of Thursday, he's still weighing choices.  
One option: Iran shuts Fordo down itself.  
No final call made so far.

Trump is carefully considering all options to handle Iran's Fordo site, showing his thoughtful approach to a tough situation