Moving the goalposts

Over the past few months, we've seen the justification for invading iraq move from "Saddam has WMDs" to "Saddam sought WMDs" to "Saddam was seeking WMDs". And the latest version?

The U.S.-led invasion of Iraq was justified in part because Saddam Hussein retained scientists capable of building nuclear weapons, Washington's top arms control official said Thursday.

What was Saddam supposed to do? Kill them?