In Goldwater v. Carter,[9] Congress challenged the constitutionality of then-president Jimmy Carter's unilateral termination of a defense treaty. The case went before the Supreme Court and was never heard; a majority of six Justices ruled that the case should be dismissed without hearing an oral argument, holding that "The issue at hand … was essentially a political question and could not be reviewed by the court, as Congress had not issued a formal opposition." In his opinion, Justice Brennan dissented, "The issue of decision making authority must be resolved as a matter of constitutional law, not political discretion; accordingly, it falls within the competence of the courts". Presently, there is no official Supreme Court ruling on whether the President has the power to break a treaty without the approval of Congress, and the courts also declined to interfere when President George W. Bush unilaterally withdrew the United States from the ABM Treaty in 2002, six months after giving the required notice of intent.

https://en.m.wikipedia.org/wiki/Treaty_Clause