Hunter Biden filed a motion on Saturday calling for the arrest of former Overstock.com CEO Patrick Byrne amid a defamation lawsuit for which Byrne has not appeared in court.

Biden’s attorneys filed the motion for a bench warrant Saturday, roughly two years after Biden filed suit against Byrne. This most recent filing alleges that Byrne has refused to provide a physical address or email address, so Biden’s attorneys have been unable to contact Byrne in order to complete the discovery process in the case.