Well I guess Obama assumes that you lose your citizenship since he says that he can kill you if he even just thinks you are a terrorist. Is he above the law where as a citizen you are allowed due process, you know the one where you are innocent until proven guilty? The one that is in our Constitution? Before anyone jumps all over this post, remember that as much as anyone would want our enemies killed, Homeland Security presently says that any number of people can be terrorists like returning soldiers, tea party members, second amendment defenders etc. The next president might say liberals are terrorists. Who knows? We either are a nation of laws or we are a dictatorship. Which do you want?
Of course not. In fact, the US government will be so pleased that you did that they'll give you a long vacation in their luxurious holiday accommodation at Guantanamo Bay. Be sure to send us a postcard when you arrive.
No, but he becomes an enemy combatant and subject to the laws of war. This means he can be killed as an enemy combatant using means of war, under the laws of war. If he can't be feasibly captured, he is a drone target-- and our drones kill with extreme ease as our last 7000 kills attest.