Pastor Robert Jeffress, an evangelical adviser to President TrumpDonald John TrumpAverage tax refunds down double-digits, IRS data shows White House warns Maduro as Venezuela orders partial closure of border with Colombia Trump administration directs 1,000 more troops to Mexican border MORE, issued a blistering rebuke of Christians who oppose Trump.

In an interview Tuesday on the conservative Todd Starnes Radio Show, Jeffress called evangelicals who don't support Trump “spineless morons.”

“Let me say this as charitably as I can,” Jeffress said. “These ‘Never Trump’ evangelicals are morons. They are absolutely spineless morons and they cannot admit that they were wrong.”

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The pastor also compared evangelicals who do not support Trump's stance on abortion to German Christians who “remained silent” in Nazi Germany.

“We cannot afford to be like German Christians who, in the rise of the evil reign of Adolf Hitler, just remained neutered. They remained silent. And you saw what happened there,” he continued. “I think there’s a similar wave of godlessness that is rising in our country right now and we must push back against that tide.”

Jeffress, the head of megachurch First Baptist Dallas, has made a number of controversial comments about other religions, and was denounced by Sen. Mitt RomneyWillard (Mitt) Mitt RomneyThe Hill's Morning Report — Emergency declaration to test GOP loyalty to Trump Don’t look for House GOP to defy Trump on border wall GOP lawmaker comes out against Trump's emergency declaration MORE (R) last year, who called him a “religious bigot.”