Tehran warned Washington it would activate sleeper-cells inside the US if attacked, NBC news reports citing two US officials and another source.

"The message got to Trump through an intermediary at the Group of Seven summit in Canada last week," according to the report.

I call this BULLSHIT. If the paper tiger had sleeper cells, they would have already activated. The US already attacked. Now Iran is saying if you do it again, we will strike. That's laughable.