The same way I knew the Norks had it before they proved it with a test.
And the Norks had help from China.
Guess who Napoleon Big Ears owes lots of favors to.
OK, then that means a whole new ballgame in the world. Iran with a nuke means game over for Western interests and Israel about to attack. The world asks the Israelis to wait and give diplomacy a chance, which is a joke. Yet, the West does nothing especially under the “leadership” of this President. Sanctions will have no effect as in N. Korea. So, when do the Iranians inform us?