Frattini said he wanted Sun to be "sure of two things that he has the full right to be heard and is completely respected."

Sun refused to complete a doping test conducted by the international testing company IDTM on September 4, 2018, saying the Doping Control Officer (DCO) and her assistants lacked sufficient authorization and credentials.

His case was heard by FINA who decided on January 3 this year that the swimmer was not guilty of anti-doping rule violation. WADA disagreed and appealed the decision.

In the hearing, Sun explained that he stopped cooperating in the process because he found the Doping Control Assistant's behavior uNPRofessional.

"He took out his cellphone and started to film me. He said he was a fan of mine and liked me a lot. This was ridiculous. That's why I started to be suspicious," Sun said.

IDTM testing coordinator Tudor Popa said it was the DCO who gives doping control training to his or her assistants.

Popa said they offer the DCOs doping control "education" while the latter "will give training" to their assistants.

Sun said another reason for him to protest was that he didn't see his or their names on relevant documents.

"I only saw FINA's authorization letter. Although my English is not good enough for me to understand everything on the letter, I did not see my name on it," said Sun.

"Neither did I see names of the three testing personnel on the letter. In my opinion, they should carry with them a clear document with their names on it in order to conduct a test on me," he said.

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