"I don't know. I haven't made the determination," the Republican front-runner told The Washington Post in an interview
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.
Priebus defended the rules on Sunday, dismissing Trump's comments as "rhetoric" and "hyperbole."
"Since I know what the truth is, I don't really worry about it because I know what is right and I know what is wrong," he told CNN's Dana Bash on "State of the Union."
Priebus said the delegate rules are up to each state, and there's nothing the RNC can do to change them at this point of the election.
"Everyone knows what the rules are," he said. "Everyone knows that the RNC can't change the rules between now and the convention."
And RNC communications director Sean Spicer dismissed Trump's comments about Priebus Monday, calling the GOP under Priebus "the gold standard of political parties."
"Any candidate who got the nomination would beg Reince Priebus to stay as chairman because he's been so successful. Under this chairman we've put together the most resources political party in the history of the United States" Spicer told CNN's John Berman and Kate Bolduan on "At This Hour with Berman and Bolduan."
"When you look at our field operation and our data and digital operation, and our opposition research on Hillary Clinton and potentially Bernie Sanders, it's amazing. We are the gold standard of political parties. I think any candidate would be lucky to have Reince Priebus as a chairman and they should be begging him to continue the successes he's had," Spicer said.