capitol hill to a joint session of congress. i was at the news conference today in the east room watching the relationship, watching them hug each other, giving them a handshake. beyond that it certainly belies some major, major differences. you could hear president macron sort of weaving those into his conversation, about climate change, about the economy, particularly iran, as you said. there is a sense here that he's trying to pull the president of the united states into a new way on iran, a different type of agreement after the president is likely to reject the agreement next month to pull the u.s. out. president macron is trying to find another way here, a supplemental agreement. the question is why would iran go for that? >> right. >> reporter: so after the pomp and circumstance, we're going to hear tonight, certainly i'm not sure anything has change ed substancewise between the two leaders, but it's a fascinating relationship unfolding before our eyes. >> it certainly is unfolding before our eyes. as we await for these arrivals,