Trump knows bombing Iran's Fordo nuke site has pros and cons.  
He thinks destroying it's necessary due to weapons risk.  
A source says he feels there aren't many options left.  
Officials say he approved attack plans but hasn't decided yet.  
He's open to U.S. joining strikes if needed to take out Fordo.  
As of Thursday, he's still weighing choices—no final call.  
One option: Iran could shut Fordo down itself if willing.

Trump is carefully considering all options with a hopeful attitude, balancing risks and potential benefits before making any final decision on Fordo.