HI may not have a choice if the suspicion of many of us is correct. Although one of the attorneys has stipulated that place of birth is irrelevant, the issue seems embedded in any challenge.
My hunch has always been that if one state (or Congress) stands up and does the appropriate and easy thing, he will resign or decline to run for a second term (or worse +/-) "for the good of the nation".
If so, the question then becomes whether "they" have the guts to put up Hillary; if not, who?
His massive ego will not allow for that.