Republican National Committee Chairman Reince Priebus speaks during the Conservative Political Action Conference on March 4, 2016, in National Harbor, Md. | AP Photo Priebus: GOP nominee will be Trump, Cruz or Kasich

Republican National Committee Chairman Reince Priebus on Tuesday said that the Republican nominee will be one of three remaining candidates in the primary race — and not an outsider.

In an interview on Fox News with Sean Hannity, Priebus also declined to peg the race as a one-on-one contest between Donald Trump and Ted Cruz, who are significantly ahead of John Kasich.

Pressed by Hannity about how Kasich could possibly flip hundreds of delegates at a contested convention in Cleveland in July, Priebus said he'd have to ask Kasich directly. "I'm not gonna do something right now that's going to be an affront to John Kasich," he said.

In recent days, Mitt Romney, Paul Ryan and others have been floated as potential last-minute nominees that could get the nomination at the Republican National Convention.

Priebus’ comments echo similar statements made Sunday morning on television. Cruz and Trump have ripped the possibility of an outside candidate, and Trump has repeatedly suggested he could run as a third-party candidate if he feels the GOP treats him unfairly.