James Blaesing asked a court in May for the 29th president’s disinterment as a way “to establish with scientific certainty” that they are related.
Harding’s legal heirs oppose the move.
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President Herbert Hoover, centre, delivers the dedication address at the memorial in Marion, Ohio to Warren Harding (AP)
They say they have already accepted DNA evidence that Blaesing’s mother, Elizabeth Ann Blaesing, was the daughter of Harding and Nan Britton.
The dispute looms as benefactors prepare to mark the centennial of Harding’s 1920 election with site upgrades and a new presidential centre in Harding’s hometown of Marion, Ohio.
