RNC has more standing than Trump. They are the once who have to certify the candidates as eligible. They are the ones penalized if the court later determines ineligibility. Trump is only damaged if he looses to Cruz. Or if he chooses he or Rubio as VP and then he and the RNC would be charged for filing fraudulent eligibility papers.
Trump is spending needless money on Cruz if Cruz is ineligible.
The RNC would only be damaged AFTER they’ve certified Cruz as eligible and he turns out not to be. They can’t get a declaratory judgment any more than Cruz can. There has to be a case (with standing) first. I had thought maybe RNC could have standing but after thinking it through I don’t think they would have standing until AFTER Cruz is the nominee, and that’s too late.
Trump has standing already because he is spending money against Cruz. Money is injury.