Iranian negotiators did walk out of the US-Iran peace talks venue in Switzerland on June 21 after Trump threatened military action and made hostile statements — this is confirmed by multiple outlets including Iranian state media, the Guardian, Reuters, and NBC. However, the claim that Trump is "single-handedly destroying" the entire peace process goes beyond what we can verify. While the walkout was a significant protest, US officials disputed the characterization of the talks breaking down completely. According to Guardian reporting, negotiations continued afterward through mediators. The actual disagreements in the talks centered on specific issues like Lebanon ceasefire terms and conditions for reopening the Strait of Hormuz. So while Trump's threats clearly disrupted the talks and prompted Iran's delegation to leave, pinning the entire fate of the peace process on his actions alone is more opinion than established fact.