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So your saying a legitimate President is the same thing as a usurper?
If they aren't the same, you've yet to "spell it out" dude.
The Constitution provides only one way to remove a sitting President: impeachment.
Accordingly, if a court were to determine that he is ineligible for the office, the only recourse would be impeachment.
Recall, however, that a Democrat Senate refused to find Bill Clinton guilty of (blatent) perjury and (obvious) obsgruction of justice.
It would not surprise me if, should Obama be found to have born in Borneo, that a Democrat Senate would not judge that peachy keen.
I'm saying that the procedure is the same to remove a president whether the wrong doing occurred while in office, before holding office, or occurred while running for office. If it turns out that he was born in Soviet Russia, was carefully planted here by the ghost of Khrushchev and placed in power by Putin himself, the process of removal is the same.