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Self-described white nationalist William Johnson says he will not attend the Republican National Convention after Donald Trump's campaign says he was included by mistake on their list of California delegates.

“They did not intend to have me as a delegate and so I complied with their requirements and I resigned,” Johnson told NBC News in an interview, adding that he understands the label of white nationalism carries with it “negative baggage.”

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“They need to coordinate everything and make this a successful and palatable campaign to the entire nation,” said Johnson, adding “My pulling back and not being a delegate is the best thing to do. So I am not bitter.”

The Trump campaign says that Johnson, the chairman of the American Freedom Party, was included as a delegate by mistake and that he was eliminated from a corrected "final" list of delegates in advance of California’s June 7 primary.

But Sam Mahood, a spokesperson for the Secretary of State, told NBC News late Tuesday that Johnson is locked into the position.

"Monday, May 9th was the statutory deadline to submit the delegate list," Mahood said. "Trump's campaign reached out to our office to revise that list today. We informed the campaign that we would not be accepting their revision because it was past the statutory deadline. William Johnson will remain on the Trump campaign's certified list of delegates."