We need to work on passing laws in a few big states requiring that to be on the ballot a candidate must present an official original birth certificate.
We will not get the courts to overturn the last election, especially after all this time. We can stop this from happening again.
If a person can’t get on the ballot in enough states he can’t win.
If he is "allowed" to serve out the entire term and "merely" be voted out or disqualified during the next round...his precedent will have been set. Future POTUS candidates who were born with foreign citizenship will now be eligible (WAY past the grandfather clause). It would follow, naturally, that Naturalized citizens will be promoted next.