Donald Trump has been called a lot of things in the 2016 presidential race.

On Sunday, Khizr Khan, the Muslim father of a U.S. Army soldier killed in Iraq in 2004, labeled Trump a "black soul."

Is that term new to you? It is to me. A quick Google search turned up this definition at urbandictionary.com:

black soul

An individual who lacks the capacity for empathy and compassion

My immediate question: Is there a deeper spiritual connotation — perhaps a religious or theological history associated with that description of which I am not aware? 

Here is the context of the quote, via CNN:

Washington (CNN) Khizr Khan, the father of a Muslim US soldier slain in Iraq in 2004, said Sunday that Donald Trump has a "black soul," indicating he lacks empathy and compassion.

Khan told CNN's Jim Acosta on "State of the Union" that he hopes Trump's family will "teach him some empathy."

"He is a black soul, and this is totally unfit for the leadership of this country," Khan said. "The love and affection that we have received affirms that our grief -- that our experience in this country has been correct and positive. The world is receiving us like we have never seen. They have seen the blackness of his character, of his soul."

Khan moved into the national spotlight after he pulled out a pocket copy of the Constitution during his speech at the Democratic National Convention. He said Trump would have barred his Muslim family from entering the United States.