Until then this is nothing but hearsay meant to forestall an Israeli attack. The US has never attacked a nuclear reactor in the middle-east, although it had plenty of opportunities to do so with Iraq and Syria. In both cases, Israel had to go it alone and the US even condemned the action.
U.S. police captain's son pleads not guilty in ISIS group plot (AP)
from the article: U.S. has pinpoint attack ready on Iran, says Israeli official