Faced with its nuclear arsenal and growing missile capability, Trump spouted threats like a hot-springs geyser. In fact, North Korea has continued producing nuclear weapons fuel and, presumably, building nuclear weapons. Trump seems to think that faced with his threats, Iran would have no choice but to back down. Iran has no reason to think that doing Trump's bidding would satisfy him. In that case, Trump can claim to have deterred Iran from doing something it had no intention of doing.
Source: Libya Today May 28, 2019 12:33 UTC