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Bob Costas: A cloud of doubt will hang over Russian medals in Rio

02:17

Bob Costas, NBC’s prime-time host for the 2016 Rio Olympics, weighs in on the decision by the IOC not to ban all Russian athletes from the Summer Olympics despite evidence of state-run doping. “The best message to send would’ve been to ban the entire Russian delegation. Now you have 28 separate international sports federations having to sort through all this.” (Run time: 2:17)