Our general election for president is 50 state elections plus a District of Columbia election for the accumulation of state level electors.
States control eligibility via state election law. State court rulings can be appealed to the federal judiciary but the vast majority of eligibility challenges originate at the state level.
Between 2008 and 2014 the Supreme Court of the United States denied hearing every one of 26 petitions to intervene in Obama’s natural born citizenship eligibility.
Let me simplify it for you. It will involve a new filing in a Federal court like the DC circuit and would have nothing to do with any State filing or court. It would be new case done by a democrat operative and its effect would be national. Or, say its in the 9th cir, or any District the dems control the judiciary then it takes out so many states he could not win anyway.
Now what are the odds that Hillary and democrats do not already have such a court and judge lined up just waiting?