After the United States’ overnight strikes on Iran’s secretive nuclear program, the most important question is at least a “known unknown” – that is, what remains of it. The answer could define the region for decades to come.

Congressional leaders expressed surprise Saturday night about President Donald Trump's announcement he had ordered a U.S. attacked on three Iranian nuclear sites, with some Republicans praising the move and some Democrats questioning the president's authority.

The United States’ overnight attack could cause further escalation. To Israelis, it is already seen as a victory for Israel, and for Prime Minister Benjamin Netanyahu.