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On "Hannity" last night, former Mexican President Vicente Fox stood by his comparison of Donald Trump to Adolf Hitler, saying the Republican presidential front-runner "believes in the white supremacy."

"Please wake up, America, from this Republican nightmare that is causing a lot of noise outside of United States," Fox said. "[It] is really worrying us outside of the United States."

Do you even care about America? Sean Hannity fired back.

"I respect very much America. That's why I intervene, because it worries me for America, it worries me for the world, it worries me for Mexico," Fox replied.

The former Mexican president said it's America's right to build a wall along the U.S.-Mexico border - as Trump has repeatedly called for - but walls simply don't work.

"I think walls work pretty good, actually. That's why criminals are surrounded by walls in prison," Hannity countered, pointing out that 642,000 crimes have been committed in the U.S. by illegal immigrants since 2008, according to the U.S. Border Patrol.

Fox said that's a lie and the number is not accurate.

"So our Border Patrol's lying?" Hannity pressed.

Fox said that he wanted to focus on Trump, who "lies and lies and lies and uses whatever is convenient for him without any attention to facts."

He added that Trump "believes in the white supremacy," again likening the Republican front-runner to Adolf Hitler.

"That is a disgraceful comment, sir, for you to say," Hannity said. "That's disgraceful."

Watch the fiery "Hannity" interview above.

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