If Donald Trump clinches the 1,237 delegates required to win the Republican nomination, he said he's not sure he'll keep Reince Priebus as chairman of the Republican National Committee. "I don't know. I haven't made the determination," the Republican front-runner told The Washington Post in an interview posted Sunday. The comments come as Trump spent the last few days attacking the Republican Party's nominating rules -- calling the process "rigged" against him -- which has caused top members to fight before their meeting in Florida later this week.