Sen. Rand PaulRandal (Rand) Howard PaulGraham promises ObamaCare repeal if Trump, Republicans win in 2020 Conservatives buck Trump over worries of 'socialist' drug pricing Rand Paul to 'limit' August activities due to health MORE (R-Ky.) called Donald TrumpDonald John TrumpWarren unveils Native American policy plan Live-action 'Mulan' star spurs calls for boycott with support of Hong Kong police Don't let other countries unfairly tax America's most innovative companies MORE an “orange-faced windbag” on Monday, the latest insult in his feud with the GOP presidential front-runner.

“Donald Trump is a delusional narcissist and an orange-faced windbag,” he said on Comedy Central’s “The Nightly Show.”

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“Have you ever had a speck of dirt fly into your eye?” he continued, mocking Trump."[It is] annoying, irritating and might even make you cry.

“If the dirt doesn’t go away, it will keep scratching your cornea until eventually it blinds you with all its filth. A speck of dirt is way more qualified to be president.”

Paul also likened Trump to Nazi propagandist Joseph Goebbels.

“I’m not sure I would say Trump is Hitler – Goebbels maybe,” he said.

Asked if he would kill an infant Hitler or Trump if he went back in time, Paul said he wasn't "seriously" comparing Trump to either Nazi.

"I have compared him to Gollum from ‘Lord of the Rings,’” he jokingly added, referring to a monster from the fantasy series.

Paul also took a shot at Dem contender Sen. Bernie Sanders (I-Vt.), saying young people who supported him would end up disappointed.

“If you want Santa Claus and something free, then [you are] going towards Bernie,” he said.

“I think there are a lot of people out there who are more realistic about what they want. If you understand that really nothing in life is free, but you want freedom and opportunity, then [you are] coming our way.”

Paul urged libertarian-leaning voters to back him regardless of their party affiliation.

“On the right there are people who believe in economic liberty,” he said. "On the left, there are people who believe in personal liberty.

“What we are trying to do is join liberty together and say across the board, government ought to stay out of your life."