Carl Levin actually said...

"The old system was a fixed-site system that could not be moved to adapt to a changing threat."

"The new system starts with capability against existing threats, but then adds capability against future threats."

"isn't it true that the currently deployed GMD system has the ability to defend the United States from a potential future Iranian long-range missile threat?"

"Before new capabilities are deployed, they must undergo testing that enables assessment under realistic operational conditions."