In case you need to hear why he's here -
So what is the purpose of his speech tomorrow? Netanyahu explains:
The purpose of my address to Congress tomorrow is to speak up about a potential deal with Iran that could threaten the survival of Israel. Iran is the foremost state sponsor of terrorism in the world….Iran envelopes the entire world with its tentacles of terror. This is what Iran is doing now without nuclear weapons. Imagine what Iran would do with nuclear weapons. And this same Iran vows to annihilate Israel. If it develops nuclear weapons, it would have the means to achieve that goal. We must not let that happen.