It's fascinating how, in addition to genuflection to the person of Benjamin Netanyahu, breaking off any nuclear agreement with Iran is quickly becoming a litmus test for GOP presidential candidates. If you look around, virtually everyone who doesn't oppose any agreement or has strong ideological commitments that preclude support, is surprised at how tight the restrictions the US negotiated ended up being. (Examples one and two; Dennis Ross struggles to find quibbles.) There are real questions about how much latitude the next president would have to tear up an agreement within the bounds of international law. But Jeb Bush has already signed on: he'll try to ditch it. And now Scott Walker says he will, too.
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