The Ruling on Casting Aspersions on Mu'awiyah (may Allah be pleased with him)

The questioner:
Honorable Shaykh, may Allah grant you success. A questioner from outside this country says: In our country, there is a caller to Islam from among the people of the Sunnah, but he always says that Mu'awiyah (may Allah be pleased with him) claimed to have a stronger right to the caliphate than 'Ali, and that he fought him over it. He says he repeats this. What is the guidance regarding this caller, and should we warn people against him?

The Shaykh:
It is not permissible to hold this bad belief about Mu'awiyah (may Allah be pleased with him), which is a bad opinion of him. In fact, Mu'awiyah was demanding the blood of 'Uthman; he was demanding the blood of 'Uthman, whom the Khawarij killed, and he was demanding retribution for him. Yes.

The questioner:
Honorable Shaykh, may Allah grant you success.

The Shaykh:
Mu'awiyah was from the group of 'Uthman, from the Banu Umayyah. Yes.