Holocaust denial is a criminal offense in Germany and is punishable with a sentence of up to five years in prison, and similar laws exist in other European countries.
Miedlar, who pleaded not guilty, could face up to three years in prison if convicted on the charges.
Fuentes revealed the news about his channel to his 86,600 Twitter followers on Saturday.
Yad Vashem: Educating on the Holocaust, fighting against antisemitism
Republican congressional candidate Arthur Jones openly denies the Holocaust took place.
Iranian Supreme Leader Ayatollah Ali Khamenei praises Holocaust-denier Roger Garaudy as brave and tireless.
Malkin has been a vocal supporter of Holocaust denier Nick Fuentes, prompting the Young America's Foundation to distance itself from her.
According to a report, the group "Labour Party Compliance: Suspensions, Expulsions, Rejections Co-Op" was co-founded by Labour candidate Maria Carroll and included Holocaust deniers.
His comments came days before a Jordanian researcher claimed just 400,000 Jews had been killed by the Nazis.
Officials were criticized for letting the neo-Nazis march on the anniversary of Kristallnacht.