Fox News reporter Geraldo Rivera was caught on a hot mic late Tuesday blasting Bernie Sanders Bernie SandersKenosha will be a good bellwether in 2020 Biden's fiscal program: What is the likely market impact? McConnell accuses Democrats of sowing division by 'downplaying progress' on election security MORE’s win in West Virginia’s Democratic presidential primary.

“So annoying — this guy is so annoying,” he said of Sanders as the independent Vermont senator made his victory speech in Salem, Ore.

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“Your mic is hot,” fellow Fox News personality Sean Hannity told Rivera. "What are you saying?”

“He’s so annoying,” Rivera added. "People that think his supporters are going to go to Donald Trump Donald John TrumpObama calls on Senate not to fill Ginsburg's vacancy until after election Planned Parenthood: 'The fate of our rights' depends on Ginsburg replacement Progressive group to spend M in ad campaign on Supreme Court vacancy MORE are smoking dope.”

Rivera’s assessment drew laughter and an exclamation of “what?” from the other assembled Fox News journalists.

Reporter Eric Bolling then countered Rivera by pointing to Sanders’s popularity with Trump’s supporters in West Virginia.

“One of the most important things coming out of tonight, Sean, is not who won West Virginia, not who won Nebraska — the most important thing for me that came out of tonight is that exit polling shows that 43 percent of Bernie Sanders voters would vote for Donald Trump over Hillary Clinton Hillary Diane Rodham ClintonWhat Senate Republicans have said about election-year Supreme Court vacancies Bipartisan praise pours in after Ginsburg's death Trump carries on with rally, unaware of Ginsburg's death MORE,” he said.

"That’s a massive number," Bolling added. "There’s an opportunity for Donald Trump to take Bernie Sanders voters.”

Sanders on Tuesday won West Virginia’s Democratic primary, while Trump, facing no opposition, won the GOP contest.

Exit polling on Tuesday found that 44 percent of Sanders’s supporters in West Virginia would back Trump over Clinton in a general presidential election. One-third of voters identified as being independents, according to exit polling.

Only 24 percent said they would support the Democratic presidential front-runner, while 31 percent said they would back neither Clinton nor Trump next fall.