So Now We Have the First Draft of the Letter Sent to the Ayatollahs by Cotton and his band of

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45. The misguided, condescending letter from Republican senators to Iran

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It starts with the patronizing premise that "you may not fully understand our Constitutional system" and goes on to explain, first, that any international treaty will need to be ratified by a two-thirds vote in both chambers of Congress and that, unlike the president of the United States, senators "may serve an unlimited number of 6-year terms." The message to the mullahs: don't get comfortable with any deal, because we're going to scrap it as soon as we can.

On the Lawfare blog, Harvard Law School professor Jack Goldsmith describes the letter as "embarrassing," because it's technically wrong:

The letter states that “the Senate must ratify [a treaty] by a two-thirds vote.” But as the Senate’s own web page makes clear: “The Senate does not ratify treaties. Instead, the Senate takes up a resolution of ratification, by which the Senate formally gives its advice and consent, empowering the president to proceed with ratification” (my emphasis). Or, as this outstanding 2001 CRS Report on the Senate’s role in treaty-making states (at 117): “It is the President who negotiates and ultimately ratifies treaties for the United States, but only if the Senate in the intervening period gives its advice and consent.” Ratification is the formal act of the nation’s consent to be bound by the treaty on the international plane. Senate consent is a necessary but not sufficient condition of treaty ratification for the United States. As the CRS Report notes: “When a treaty to which the Senate has advised and consented … is returned to the President,” he may “simply decide not to ratify the treaty.”

Dan Drezner, writing for Post Everything, adds that the letter may "paradoxically help Obama" by persuading Iran's leaders to hatch a successful bargain now with the United States rather than further down the road after Obama has departed. Some argue that a deal pushed through by the White House will not be that easy to overturn later, especially if it appears to be working.

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http://www.washingtonpost.com/blogs/worldviews/wp/2015/03/09/the-misguided-condescending-letter-from-republican-senators-to-iran/?postshare=8221425928947092