U.S. Ambassador to NATO Matt Whitaker urged Iran to seek peace with the U.S. and Israel as official nationwide remain on high alert for domestic terror activity through sleeper cells.

Iran remains 'obsessed' with building nuclear deterrent despite damage incurred from U.S. strikes last month, but suggests its still open to negotiation in a move that one expert warns is a ploy to buy time.

Iran says its nuclear program is for civilian energy purposes, and so peaceful. But it had enriched uranium to a near weapons-grade level, and well beyond what is needed for energy, putting it close to developing a bomb if it opted to do so.