If this threat is real my reaction is that all you need to look for are the folks who were active backers of this agreement that was never confirmed by the Senate. Shummer voted against it originally but was bashing Trump about leaving it now so I doubt he is one of them.
The Euro trash seems to be the target if this is for real. The biggest and loudest screams in regard to this in Europe today seem to be:
Macron
Merkel
Boris Johnson
And likely a whole raft of little nobody's who worked for them in 2015.
If this threat was actually made, it tarnishes everyone associated with the agreement, the guilty as well as the innocent (if there are any?), and shows us why most politicians seem to be more interested in backhanders than serving their constituents.
There are possibilities in addition to bribery, like blackmail.
The Iranians must be desperate to play this card. Because now they may have set into motion something that will do unimaginable and unrecoverable damage to the uniparty and the enemedia.