The head cleric of the Church of England says he's perplexed by Christians who support President Donald Trump.

The Most Rev. Justin Welby, the archbishop Of Canterbury, was asked by ITV's Robert Peston on Sunday if he understands why fundamentalist Christians in the United States are so supportive of Trump.

"There's two things going through my mind: Do I say what I think, or do I say what I should say? And I'm going to say what I think," said Welby. "No, I don't understand it. I really, genuinely do not understand where that is coming from."

White evangelical Christians have been key part of Trump's base, with 81 percent of them voting for him in 2016. A Fox News poll last month found 66 percent approve of the job he's doing, far higher than the president's overall approval rating of 38 percent.