Talk radio host and former Republican presidential candidate Herman Cain said Wednesday that it would be "stupid" for a member of Congress to vote against President Trump's tax reform plan.

"A member of Congress that would go against that, whatever it is, they would be stupid," Cain said in an appearance on Fox News's "Fox & Friends."

Cain said that lawmakers who oppose Trump's tax plan would qualify as "Republican in Name Only" (RINO) — an insult meant to question a Republican's party bona fides.

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"Some of us are going to go RINO hunting in 2018," he said.

Cain expressed optimism that Trump's tax reform plan would succeed, saying that the American people are closely paying attention to the issue.

"I don't think the tax simplification and tax cut reform is going to fail. I really don’t because I believe that the American people are engaged enough with their own finances," he said in part. "They know they are paying too much in taxes. They know it is too complicated. So I believe that he is going to get that one across the finish line."

Cain, the former CEO of Godfather's Pizza and a 2012 presidential candidate, has been a strong supporter of Trump.