First, you are making the unproven allegation that he did indeed possess and travel on an Indonesian passport. Even making that assumption, the US recognizes dual nationality and allows someone to travel on another country's passport without taking away their American citizenship.
However, dual nationals owe allegiance to both the United States and the foreign country. They are required to obey the laws of both countries. Either country has the right to enforce its laws, particularly if the person later travels there.Most U.S. citizens, including dual nationals, must use a U.S. passport to enter and leave the United States. Dual nationals may also be required by the foreign country to use its passport to enter and leave that country. Use of the foreign passport does not endanger U.S. citizenship.Most countries permit a person to renounce or otherwise lose citizenship.
Do you have more information on when and how Obama travelled on an Indonesian passport? How did he leave and reenter the US? On an Indonesian passport or a US passport?
Do you have any further information on how a 20 year old American student entered and exited a country with a ban on Americans entering (except in case of business)? Or how about his Occidental transcripts? Do you have info on how an American, 18 year old freshman was assigned to share a room with 2 foreign, muslim students? Or maybe he was in school as foreign student himself. The point is-— we don’t know. And we don’t know because Obama does not want us to know and thinks he above any and all questions. That is scary!