Women say David Sullivan told them they needed to have sex with him to feature in his newspapers.
Dabinderjit Singh of the Sikh Federation has written to the government calling for an inquiry.
Firms will be expected to activate built-in features to stop children accessing sexually explicit images.
The bereaved families of the victims of Valdo Calocane speak at a press conference in London.
Testimony to US Congress members is the first time a woman abused and trafficked by the late financier has publicly spoken of attending royal residences.