On February 7, the Minnesota Supreme Court issued an opinion in Growe v Simon, A23-1354, explaining why it allowed Donald Trump on the Minnesota Republican presidential primary ballot. The order to allow him on the ballot had been issued in November last year, but only now has the Court explained its reasoning.
The opinion says that the choice of which presidential candidates appear on a primary ballot is for the party to decide. As to the general election, the court said it would not rule on that because it is too early, and it is not certain that Trump will be the Republican nominee.