LOUISVILLE, Ky. (WDRB) -- An "excruciating crisis." That's what the president of Louisville's Southern Baptist Theological Seminary calls Republican presidential nominee Donald Trump.

Albert Mohler, who leads one of the largest seminaries in the world, says there are no good choices this year for evangelical Christians.

"Evangelical Christians have been able to go into the voting booth, at least since 1980, and pretty predictably vote for the Republican presidential candidate," Mohler told WDRB.

But Mohler says this year is different.

He says Donald Trump does not represent the traditional Christian conservative values that drew Republicans to the GOP.

"With the candidacy of Donald Trump, the character issue just looms massive over this entire equation," said Mohler.

And Mohler says the release of that sexually explicit conversation involving Trump only confirms that.

"It didn't look like just someone who was talking locker room talk. It looked like someone who was premeditating being a sexual predator," he said.

In a column for the Washington Post, Mohler calls Trump an "excruciating crisis" for evangelicals, who cannot in good conscience vote for either him or Hillary Clinton.

"Evangelicals are in an excruciating predicament," said Mohler.

That predicament is apparent in Mohler's own denomination, where one prominent Southern Baptist pastor is defending Trump even after the leaked tape.

"These statements were lewd, offensive, and indefensible. But they were not enough to make me vote for Hillary Clinton," said Robert Jeffres, the pastor of First Baptist Dallas in an interview on Fox News.

But Mohler believes there is a third option.

He plans to write-in his choice for president, preferring to lose an election and keep a clear conscience.

"The first responsibility of evangelicals is not and has never been political. The first responsibility of evangelicals is to be the people of the gospel," said Mohler. 

People, Mohler says, that put principle over politics.

"My greatest hope is that we do not experience the great evangelical embarrassment."

Mohler says evangelicals will come to different conclusions about how to vote.

But he says it's too soon to tell whether Trump will cause a permanent split between conservative Christians and the GOP.

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