WSJ: US believes Iran's nuclear program too advanced for 2015 deal to be effective

Washington believes the 2015 nuclear deal with Iran can no longer achieve the key condition of keeping Tehran one year away from a breakout to a nuclear bomb, The Wall Street Journal reports.

The US assesses that the time Iran would need to build a bomb if it decides to do so is now much less, the report says. This assessment has been shared by various Israeli officials who have said they believe Iran would need only a few short months at this point.

The report says this likely means American officials cannot agree to a return to the previous accord, and may be demanding alterations to account for the advancements in the nuclear program.