Trump threatens a hostile takeover of GOP
What Trump is really saying is that he is going to whine about the unfairness of having to play by the rules. It is more evidence that he lacks the temperament to be President. He is playing into the hands of those who pushed others to join the NeverTrump movement. He has the diplomatic skills of Atilla the Hun.
Amping up his feud with the Republican National Committee over the selection of delegates, he warned vaguely of consequences at the Cleveland convention.