Anti-doping doping leaders were challenged to produce more credible evidence of Russian cheating by a leading Olympic executive on Saturday. Leaving a meeting of the World Anti-Doping Agency executive committee, IOC representative Gian Franco Kasper dismissed the credibility of the report that detailed Russian state-sponsored doping.

Manipulation of samples at the 2014 Sochi Winter Games and cover-ups of positive tests across dozens of summer and winter Olympic sports was reported by WADA investigator Richard McLaren in July ahead of the Rio de Janeiro Games.

"I want to see the proof," Kasper, who is also president of the skiing federation, said in Glasgow. "We cannot say it's correct or not. He has to bring proof with names."

Former Russian anti-doping lab director Grigory Rodchenkov told McLaren that samples of Russian athletes were passed through a concealed hole in the wall during the middle of the night at the Sochi Games, with the help of intelligence officers from the FSB, the current version of the Soviet Union's KGB.

"You know this hole in the wall in Sochi was Hollywood for me ... they had a key for the door," Kasper said. "The KGB are so stupid they have to drill a hole in the wall? Come on."U.S. Anti-Doping Agency chairman Edwin Moses, the gold medal-winning and world record-setting hurdler from the 1970s and ‘80s, said it was "ridiculous" for Kasper to question the investigation.

"Wave after wave of retests show that there are Russian athletes (doping)," Moses said after attending the WADA meeting with Kasper.