‘One and done’: Michael Phelps says dopers should be given lifetime ban

• Comments come in wake of Chinese doping scandal
• Phelps says he was happy to be tested for doping

Michael Phelps has doubled down on his support for tougher sanctions for doping - including a lifetime ban for anyone who tests positive for a banned substance.

If you test positive, you should never be allowed to come back and compete again, cut and dry," Phelps said. I believe one and done."

The World Anti-Doping Agency and World Aquatics have acknowledged that 23 Chinese swimmers tested positive for a banned substance before the Tokyo Olympics. The results were not made public until media reports surfaced this year, with both bodies accepting the Chinese explanation that the positive tests were caused by tainted food.