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At first glance, it may appear that Trump has the authority to do so, considering that the president has already used his executive powers to pull the United States from the Paris climate agreement and the Iran nuclear deal.

But those were technically not treaties, but accords. (While definitions vary and are a bit fuzzy, a treaty is generally considered to be a formal written contract between sovereign states, and recognized by international law. In contrast, an accord is viewed as a lesser animal, and because it is not a treaty it does not need Congressional approval………..

if the commitment is indeed a full-fledged, bona fide treaty such as the Intermediate-Range Nuclear Forces Treaty, that leaves the question: Does the White House have the right to flout or void treaties—described by Chief Justice John Marshall in 1823 as the “supreme law of the land”—without approval by one or both houses of Congress? Some members of Congress certainly think that their approval is needed to exit a treaty; when the president warned in July 2018 that he might pull the United States from NATO, founded on a multilateral treaty, several senators said he could expect an extensive fight in Congress.

The question seems to boil down to this: While the Constitution says that the Senate needs to approve a treaty negotiated by the president, it says nothing about pulling out of a treaty. That leaves us with a conundrum: If it takes two branches of government to make a treaty, can the White House alone terminate it?

A problem more difficult than it first looks.  The US Constitution provides no clear answers to this question, but the precedents established over more than two centuries suggest that the president may not act alone to abrogate US treaty obligations. …………

The Senate did place explicit restrictions on the president when it approved the INF Treaty in 1988, and the Conventional Forces in Europe Treaty in 1991. In each case, the Senate conditioned its consent on an understanding that the original interpretation of each treaty could not be unilaterally altered by the president. …………https://thebulletin.org/2018/11/can-trump-abrogate-the-inf-treaty-without-congress/?utm_source=Bulletin%20Newsletter&utm_medium=iContact%20email&utm_campaign=AbrogateINF