Podium protest at the world swimming championships in South Korea

China's Sun Yang, centre, holds up his gold medal as silver medalist Australia's Mack Horton, left, stands away from the podium Source: AP

Australian swimmer Mack Horton has refused to take the podium alongside controversial Chinese opponent Sun Yang at the FINA swimming world championships in South Korea.

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Horton has been a vocal critic of Sun who had been the subject of several drug taking accusations in recent years.