What does Israeli intel company Black Cube have to do with the Iran nuclear deal?

President Trump will announce on Tuesday whether he’ll pull out of the Iran nuclear deal. The Obama administration negotiated the deal. Now there’s news that a secretive Israeli intelligence company called Black Cube was hired to find dirt on two of the men involved in the negotiations: Ben Rhodes and Colin Kahl. The firm was looking for evidence that they may have been working with Iranian lobbyists, or that they may have enriched themselves from the deal. Both men say that isn’t true.