The Iran Deal as Treaty

As discussed in class today, the so-called "Iran Deal" - that is, the agreement among the P5+1 and Iran regarding limits on Iran's nuclear enrichment and development program - is one of the major international issues of the year. Just today it was reported that President Obama now has sufficient support in the Senate to ensure that Congress cannot reject the agreement. But how should we assess the agreement as a matter of international law? Looking through the lens of the law of treaties, take a look: https://www.whitehouse.gov/issues/foreign-policy/iran-deal

Update: If anyone is having difficulty getting to the full text of the agreement from the Whitehouse site, here is an alternative: http://apps.washingtonpost.com/g/documents/world/full-text-of-the-iran-nuclear-deal/1651/