House Speaker Paul Ryan, R-Wis., says he has no influence over Republican convention delegates' decisions on whether to change their minds about supporting Donald Trump.

Ryan, who endorsed Trump earlier this month, is the convention's chairman. But he told NBC's "Meet the Press" host Chuck Todd, "It is not my job to tell delegates to do, what not to do, or to weigh in on things like that. They write the rules. They make their decisions."

Asked for his opinion on the matter, Ryan said, "My opinion is not relevant here."

Trump reaffirmed Sunday that he can win the presidency whether the Republican Party gets behind his candidacy or not.

Trump said Sunday that "it would be nice" if the party got behind him, but he was prepared to go it alone if necessary.

"I think that I win either way," Trump said in an interview that also aired Sunday on "Meet The Press." "I can win one way or the other."

"You know, I'm an outsider and I won the primaries," the presumptive GOP nominee said in the interview. "I do believe that we can win either way, but it would be nice if we stuck together."