That's a stupid argument seeing as there are -no- green humans so your point doesn't make sense. EVERYONE on the planet would be investigating him if he was green. But the fact is he's a black man, nothing weird about having him there apart from it being the first time it's a non white guy. Instead of seeing him as just another p********, you have the racists who see a black man holding power, a scary thing, so they have to do everything they can to believe it can't be true, he must be a non citizen! It's just scary for some who believe the white man to be superior to have a black man who holds power over them.
Now unless you're telling me a black guy to you is as weird and as strange as a green one, that comparison is pointless.