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 So, if the talks this weekend yield progress, hawks will say, "Ah ha -- that progress was only because of sanctions, so we need more and we need to shift the goal posts to achieve maximalist ends." If the talks don't yield progress, hawks will say, "Ah ha -- that stalemate is because the sanctions are not crippling enough, so we need more and we need to shift the goal posts to ensure maximalist ends." Either way, Congress is pushing its sanctions. And if a new Congressional sanctions push is successful, the president may be blocked -- either politically or perhaps even legally -- from leveraging sanctions in exchange for Iranian concessions, killing any deal.