My thought is that Bibi came to Washington to tell Obama it was going to happen.
Obama’s butt has been saved by similar mysterious actions to allow his farcical negotiations to continue with out any danger of a bomb being developed.
Probably not in so many words. Our allies, or former allies, have been betrayed, outed, cheated, lied to, and embarrassed so many times by this administration that they often don't confide plans of this type. If Bibi had warned Obama this was going to happen, it would be on the front page of the New York Times and the brave IDF agents who were arranging the explosion would have been arrested and killed by Iran.