Khan speech sparks sales surge for 'Pocket Constitution' – made by controversial group

July 28, 2016: Khizr Khan, father of fallen US Army Capt. Humayun S. M. Khan holds up a copy of the Constitution of the United States as his wife listens during the final day of the Democratic National Convention in Philadelphia. (AP)

Khizr Khan’s now-famous moment at July’s Democratic National Convention, in which he brandished a copy of the Constitution and urged Donald Trump to read it, has spurred a surge in sales for the 'pocket' document – but with a twist.

Khan, a Muslim whose son died in Iraq in 2004, waved a copy of the document at the convention last month while objecting to Trump’s rhetoric and policies on Muslim immigration.

According to the Los Angeles Times, the "Pocket Constitution" soon topped Amazon's list of top sellers. But here's the twist: the newspaper reports that the version selling like wildfire is one favored by "armed militias" and put out "by a right-wing religious group."

The publisher, The National Center for Constitutional Studies, also has been called a “conspiracy-prone think tank” by the left-wing Southern Poverty Law Center.

The National Center for Constitutional Studies (NCCS) in Idaho, though, rejects these characterizations.

Spokesman Dan Sheridan described the group as non-partisan and said it has had nothing to do with Mormon founder and controversial conservative author Willard Cleon Skousen since he died 10 years ago.

“I represent the organization and I don’t hold conspiracy theories, and I’m not a Mormon,” Sheridan told FoxNews.com. Sheridan said the group sees the Constitution as something to unite all Americans.

“It has distressed me that only one side has stressed the Constitution and personally when [Khan] held up that document I was so excited as it proves what I have said -- that document should unite us as a people, as it protects all of us,” he said.

Sheridan said he believes their version is popular because, unlike other versions, it just includes the text of the document and the Declaration of Independence, as well as a short chapter of quotes from the founders.

The Times noted that the NCCS version, which even surged past the latest Harry Potter book to become Amazon’s biggest seller in the wake of Khan’s comments, was used by Cliven Bundy during the standoff over federal rangeland in Nevada two years ago.

The Times also cites constitutional scholars who say a number of the quotations in the NCCS version are taken out of context or altered to give the message that the U.S. is a Christian nation not to be ruled by a single government. The Times points to one quote from John Adams.

“Our Constitution was made only for a moral and religious people,” the version quotes Adams in an addendum. “It is wholly inadequate to the government of any other.”

"Well, that’s what he said," Sheridan said when asked about it by FoxNews.com. “I’m not going to rewrite the history of John Adams, that’s what he says.”

The group’s website says it has given away 15 million copies since 2004, and Sheridan said the group is delighted with Khan’s use of the document. As for the Bundy connection, Sheridan said that simply can’t be helped:

“The NCCS does not get involved with that kind of stuff. That’s his business, whatever version he uses is the one he uses.”

FoxNews.com's Adam Shaw contributed to this report.