Donald Trump posted on Truth Social on 21 June that Iran must "immediately stop their highly paid PROXIES in Lebanon" or the United States would "hit Iran very hard again, just like we did last week, only harder" 1. In a Fox News phone interview the next morning he said that if Iran closed the Strait of Hormuz the US would "blow the s--- out of them", and threatened to "take over the strait" and "collect tolls". The threats landed mid-session at the Switzerland round, the working talks implementing the 16 June Islamabad Memorandum of Understanding between Washington and Tehran.
US policy binds through three registers that do not respond to a social-media post: The White House Presidential Actions index, the Treasury sanctions authority known as OFAC, and the Federal Register, the government's record of official acts. Each carried zero Iran entries across 21 and 22 June. Trump signed the memorandum and ordered the naval blockade lifted on 16 June ; these threats added no order, designation or licence behind them.
Iran's delegation paused the talks and, by the Jerusalem Post's account, walked out on the Sunday night before returning 2. Ghalibaf refused to join the group photo and gave no joint press conference, and Iranian state media said the session stopped after an "insulting message" from the US President. US officials said the delegation stayed on-site throughout, so the two accounts of that evening differ. Either way the threats bought a diplomatic cost, not a concession.
