In the eight years of his presidency, George W. Bush will never detonate nuclear weapons, not as a test, nor as a demonstration, nor as an attack on America's enemies.
If Iran develops nuclear weapons, the Iranian government will detonate them as a test, as a demonstration, and as an attack against Iran's enemies--probably fulfilling all three purposes with a single blast--within eight years of developing them.
If the Iranian government detonates a nuclear weapon, the American left will say the Iranian government is just like the Bush administration.
If the Iranian government detonates a nuclear weapon, the U.S. government will retaliate with overwhelming conventional force, no matter where the nuclear weapon is detonated.
The weapon will be detonated within or near the Israeli border.