I honestly do see Trump just declaring he lost. "These Iranians put up a good fight and we weren't prepared." or something to that effect. He's been known to acknowledge defeat, like his complete 180 when Mamdani won.
Not an American but. There is no fucking way Trump will acknowledge that.
He didn't directly acknowledge defeat with Mamdani, at least not that I heard. It was more a case of populist game recognizing populist game.