Seems a pertinent question.
I’ve never seen this explained. BTW, when exactly did he get a US passport? Does anyone even know? I’m not even sure he traveled to Indonesia as a child on a US passport. He may have been issued an indonesian passport on his adoptive father’s request, or he may have had a Kenyan/UK Colonial passport issued on the strnegth of his Kenyan colonial status.
Obama’s passport history is another deeply held secret.