The pope says it is a cultural problem, the roots of which lie in seeing women as second class.
Fox angered the president by joining a fact-finding mission to investigate alleged abuses against farmers.
Bishop Franco Mulakkal is accused of raping a nun 13 times in the same room between 2014 and 2016.
The arrest comes at a time when the state's Christian community is reeling from a string of cases - including the arrests of five priests last month on allegations of sexual assault.
The nun from the southern Indian state of Kerala has accused Bishop Franco Mulakkal, who heads the Diocese of Jalandhar, of raping her repeatedly over a period of two years.
Bishop Franco Mullackal, who has rejected the accusations, has been called for questioning in the southern state of Kerala on September 19, the Press Trust of India reported.
Master Xuecheng he is accused of sending illicit text messages to at least six women, tempting or threatening them to have sex with him.
Sister Patricia Fox, 71, was briefly detained in April after Duterte ordered her arrest, accusing her of political activism that violated the rules of her visa.
Sister Agnes-Marie Valois saved several lives by persuading German officials to tend to some of the wounded and stole German rations to feed the injured.
Sister Catherine Rose Holzman died on Friday during related legal proceedings in Los Angeles County Court.