While experts disagree that Iran was close to developing a nuclear weapon in a few weeks as Trump claimed, that doesn't mean they wouldn't potentially have been able to develop them in a few months to a year, as Netanyahu claimed.
From what I understand, it's much harder to get to the 60% levels of enrichment Iran had already achieved than it would be to make the further transition required from 60% to 90%. No one really knows Iran's intentions, but there was legitimate cause for concern over the question of why they felt the need to develop enrichment levels as far as 60%. The situation is nuanced, as this article from June 2025 shows:
When asked by the BBC about Israel's claims on Monday, the director general of the International Atomic Energy Agency (IAEA), Rafael Grossi, said: "This is their evaluation of the situation. I'm not familiar with the internal reports or information that they may have."
However, he noted that the IAEA's latest quarterly report released in late May warned that Iran had amassed enough uranium enriched up to 60% purity - a short, technical step away from weapons grade, or 90% - to potentially make nine nuclear bombs. That was "a source of legitimate concern", he said.
Grossi also said the agency could not provide assurance that the Iranian nuclear programme was exclusively peaceful because Iran was not complying with its investigation into man-made uranium particles discovered by inspectors at three undeclared nuclear sites.
"At the same time, we recall that whereas until the early 2000s there used to be... a structured and systematic effort in the direction of a nuclear device, that is not the case now," he added.
www.bbc.co.uk/news/articles/cn840275p5yo