Two Democrats hoping to challenge Rep. Duncan Hunter in California’s 50th District are in a public spat about a website.

The row between Josh Butner, a retired Navy SEAL, and former Obama administration official Ammar Campa-Najjar is centered around a website called DuncanButner.com.

The website tries to tie Butner to Hunter, the embattled Republican incumbent under federal investigation, the Huffington Post reported.

It also claims that Butner’s father, a retired Arizona judge, was linked to the Ku Klux Klan and that Butner was recruited by Republicans.

Butner said that Campa-Najjar’s campaign is behind the site and denounced it in a statement and on Twitter.