A Ku Klux Klan newspaper has declared support for Donald Trump's Republican run for U.S. president, saying America became great because it was a white, Christian republic.

The Crusader, one of the white supremacist group's most prominent publications, published a lengthy endorsement and defense of Trump's message on the front page of its current issue under the headline: "Make America Great Again."

"Make America Great Again" is Trump's campaign slogan.