Even the majority of Americans know that the news of Iran developing a nuclear weapon on weeks was a lie told to attack Iran. The US intelligence community affirmed that the government of Iran has not ordered the restart of the suspended nuclear weapons programme. King Trump disputed the reports of the country's intelligence because he wanted to start a war.
US will never be comfortable with the Idea of Iran having a nuclear weapon, Trump asked a reporter who questioned him of the war against Iran whether she'll be happy to watch a hostile nation own a weapon that destroys the world? Iran says the programme wasn't designed to launch any form of attack on other countries, but Trump is a superstitious person and believes that 20years later Iran could change their mind and start threatening the US with the nuke.
However all his efforts can only delay Iran's possession of a nuclear weapon, for a nation with Uranium close to 60% of becoming a little boy, even if Israel distroyed the total amount of sites where the programme is held, the Iranian government will probably find its way around starting a new one and someday complete the assimilation.