President Donald Trump told ABC News on Tuesday morning he is "not happy" with either Israel or Iran after the opening hours of a nascent ceasefire between the two combatants were marred by reported exchanges.

Trump spent his final day at NATO disputing intelligence that said U.S. strikes on Iran's nuke facilities set the country back only by months.

Iran fired a final wave of deadly missiles at Israel before acknowledging the deal, while Israel said it accepted the proposal because all its military objectives were already achieved.