Israel's command of Iranian air space leaves few obstacles in the way of its expanding bombardment, though it will struggle to deal a knock-out blow to deeply buried nuclear sites without the U.S. joining the attack,

President Donald Trump arrived in Washington, D.C., early Tuesday morning after abruptly leaving the G7 summit in Canada to address the escalating conflict between Israel and Iran.

President Trump spent the first months of his term holding back Israel’s push for an assault on Iran’s nuclear program. With the war underway, his posture has gyrated as he weighs sending in the U.S.

In its airstrikes, Israel has targeted the assets and leadership of the Quds Force, an arm of Iran's elite Revolutionary Guard.