Because the crimes were committed on American soil.

I'm all for having the trial on a military base. It would probably be the least expensive way to do it. The MPs could supply the security. As far as I know, they don't have to pay soldiers overtime, either.

As for the mayor of Newburgh, it's one of the most crime-ridden cities in NY. That's why people don't go there. They have enormous drug problems. Just let the terrorists loose in downtown Newburgh in the middle of the night. They probably wouldn't survive.

Newburgh Crime Statistics