US anti-doping officials have rejected a request by the Switzerland-based governing group for cycling to hand over materials from their Lance Armstrong doping probe.
The US Anti-Doping Agency said in a letter to the International Cycling Union, that turning over their two-year doping case to the UCI would be like "the fox guarding the henhouse".
The UCI is claiming jurisdiction over the case, according to documents filed in a Texas court.
The USADA announced in June that it had brought charges against Armstrong for doping, which if proven could see the American cyclist stripped of his seven Tour de France titles.
USADA claims it has witnesses who will show that Armstrong and five former cycling team associates engaged in a doping conspiracy from 1998-2011.
Armstrong, who has vigorously denied doping, has sued USADA in federal court, stating that the agency's process violates his US constitutional rights, and he claims that the organisation has no jurisdiction in the case.