Hammad Azhar, who has served as Pakistan's finance and energy minister, says police and plain-clothed officials have burst into his home six times in recent weeks, smashed his belongings and threatened his 82-year-old father, warning that his daughter would be abducted.
Last weekend, he said police and "unknown people" took his father to a police station and released him after they went through his phone for an hour.
Azhar, who is in hiding, says he is under pressure from a "fascist regime" to leave the political party of former Prime Minister Imran Khan, Pakistan Tehreek-e-Insaf (PTI).