The answer is very easy; it's exactly as the Americans did: security trumps GATT. It's a security issue. And good work on the dangerous goods act that you passed, and we included the transport security clearances. But these people are going to be caught by the transport security clearances. It's a clear security issue, period.
As in America, we can rely upon their decision for our decision. They've made their decision; we can use the same decision. I do not see a trade issue at all.