There hasn't been a post on this thread, since the Presidents news conference. He made it clear he wanted to know what the alternative is. War! There is no guarantee that everyone will join back in with the sanctions, if the deal falls through because of Congress.

Won't Congress be giving the P5 plus one the unmistakable impression that they know better how to deal with Iran than the people in the P5 plus one that worked for a very long time on the deal?

You don't think the governments around the world will think that Congress is playing politics as usual. Democrats voting against the President might give some believability to overriding the veto. Who will be negotiating a new agreement with Iran, if Congress overrides the veto? Kerry! Is someone going to talk to Russia, and China before they vote to override the veto to see, if they are willing to reinstate the sanctions?

Overriding the veto is playing with fire.