Christian author and journalist Stephen Strang predicted in an interview on Thursday that President 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 will build on his support from evangelicals in 2020.

"I think his evangelical percentage is going to go up," Strang said on "Fox & Friends."

"I think that the hatred against Donald Trump can only be explained in spiritual terms," Strang added. "Christians call it spiritual warfare."

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"Who would've thought that a New York billionaire that is a TV celebrity would become a champion of religious rights or become president of the United States?" he asked. "I think he's been a great leader, but he doesn't get much credit for it."

Trump won white evangelicals by more than 81 percent in the 2016 presidential election, according to exit polls.

On Thursday, the president is expected to mark Religious Freedom Day by signing an executive order "updating guidance on religious prayer" in public schools.

Strang, the founder of Charisma News, describes it as "the other evangelical magazine" meant to shed light on the "spiritual point of view" about the president. He also wrote "God, Trump, and the 2020 Election: Why He Must Win and What's at Stake for Christians if He Loses."

His remarks come after the former editor in chief of Christianity Today, Mark Galli, called for Trump to be removed from office last month.