According to this page on Congress' web site, Presidents often terminate treaties by themselves: https://constitution.congress.gov/browse/essay/artII-S2-C2-1-1

According to this page on Congress' web site, Presidents often terminate treaties by themselves: https://constitution.congress.gov/browse/essay/artII-S2-C2-1-10/ALDE_00012961/ https://constitution.congress.gov/browse/essay/artII-S2-C2-1... If nothing else, the President can unilaterally declare that the other country is in breach of the treaty, so it's no longer in effect.