Dunno, I'm not buying it. Why would the US suddenly attack Iran because of the nuclear weapon development? That has been in the works for decades https://en.m.wikipedia.org/wiki/Joint_Comprehensive_Plan_of_Action#Background
Discussion
The US is very anxious about nuclear proliferation. Plus the regime in Iran has supported gangs/militias/terrorists that have attacked Americans for 45+ years.
The regime has also shown in its actions. and devotion to its political ideology ,that it cannot be trusted by its own people let alone its neighbours.
To allow them to have nuclear weapons is a dangerous gamble.