Story highlights RNC Chairman Reince Priebus dismissed Donald Trump's assertion the system is rigged

Priebus called Trump's comments "rhetoric" and "hyperbole"

Washington (CNN) Republican National Committee Chairman Reince Priebus pushed back Sunday against Republican presidential front-runner Donald Trump's assertion that the nominating process is "rigged" to block him.

Priebus dismissed 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."

Trump has watched rival Ted Cruz claim delegates in individual states where Trump has won, and stack delegate slates with Republicans who would be obligated to support Trump on the first ballot at the Republican National Convention in Cleveland but could switch to Cruz on the second ballot.

On Sunday, Trump tweeted: "Lyin' Ted Cruz will never be able to beat Hillary. Despite a rigged delegate system, I am hundreds of delegates ahead of him."

Lyin' Ted Cruz will never be able to beat Hillary. Despite a rigged delegate system, I am hundreds of delegates ahead of him. — Donald J. Trump (@realDonaldTrump) April 17, 2016

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