Sen. Ben Sasse Benjamin (Ben) Eric SasseMcEnany says Trump will accept result of 'free and fair election' McConnell pushes back on Trump: 'There will be an orderly transition' Trump says he'll sign order aimed at protecting premature babies in appeal to religious voters MORE (R-Neb.) on Sunday responded to a new book from two former Trump advisers that labeled him and other GOP senators as "enemies of the president," saying he believes most Americans believe that level of criticism is "weird."

"Republics aren’t healthy when people use words like treason about policy debates. That’s a pretty messed up worldview," Sasse said on "Fox News Sunday."

Sasse was asked about a new book from former Trump campaign advisers Corey Lewandowski Corey R. LewandowskiTrump faces tricky choice on Supreme Court pick How Trump can win reelection: Focus on Democrats, not himself Trump Jr. distances from Bannon group, says he attended 'single' event MORE and David Bossie titled "Trump's Enemies." The two men accuse Republicans like Sasse, Sen. Jeff Flake Jeffrey (Jeff) Lane FlakeHow fast population growth made Arizona a swing state Jeff Flake: Republicans 'should hold the same position' on SCOTUS vacancy as 2016 Republican former Michigan governor says he's voting for Biden MORE (R-Ariz.) and Sen. Bob Corker Robert (Bob) Phillips CorkerHas Congress captured Russia policy? Tennessee primary battle turns nasty for Republicans Cheney clashes with Trump MORE (R-Tenn.) of undermining the president. All three men have frequently criticized Trump.

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"I haven’t seen their book yet… but language about enemies and treason about policies and politics is pretty warped, and I think most Americans think it's weird," said Sasse, who was on the show to discuss a book of his own about political tribalism.

Lewandowski and Bossie appeared on "Fox News Sunday" after Sasse's remote interview, and defended the premise of their book.

"I respect Sen. Sasse, but what he has to acknowledge is that the attacks this president has faced since the day he won the election in November of 2016 have been unprecedented," Lewandowski said.

The one-time Trump campaign manager blamed the media, "establishment" Republicans and the intelligence community for working against the president's agenda.