So he had confidential US documents and they did not arrest him? Or he had confidential French documents, the CBP recognized that, and sent him back? The initi

So he had confidential US documents and they did not arrest him? Or he had confidential French documents, the CBP recognized that, and sent him back? The initial stories reported messages criticizing Trump and his science cuts. From a scientist, going to a science convention. CBP being thuggish is the simplest and stupidest explanation making it most likely.