I’m not sure that Cruz’s beating Trump in Iowa would qualify as an injury that court could remedy.
That is what happens in primary elections. One candidate wins, another loses.
The Constitution does not require a person be an NBC to run for a particular party’s nomination.
It requires a person be an NBC in order to be eligible for president.
At this time, this is not a race for the presidency. I don’t see any law that prevents a party from nominating a person who actually isn’t eligible to run.
Maybe I’m wrong on that, but I don’t know.
I really do not think that Trump can establish standing at this time, but I am also certain that he does not want to or intend to.
The constitution anticipates the voters/electors will elect an unqualified person. See 20th amendment. It talks about what to do in case of unqualified president-elect. The first authority in examination is Congress, after all the election process has run.
Meanwhile, if the people want to vote for an unqualified candidate, they are free to. Ahhh, the smell of freedom!
Courts really hate to meddle in the political process. If an unqualified candidate can pawn himself off on the public as qualified, more power to him.