No. You don't check your Constitutional rights at the door. He's still an American citizen. Just because you're coming back, it doesn't somehow erase that. Heck, they're trying to apply US Constitutional rights to illegal aliens. People that clearly have no Constitutional rights. They're not citizens to have those rights. Of course as always - if you're ignorant of the laws, they can do whatever they want.
The real joke here - Wonder what kind of porn he had on his laptop.