Re: PTI Siraj Khan says he was forced to resign
I do not think it applies to all MNA and MPAs. Many of them are going to be in parliament whichever party they contest election. They can contest election as independent, or join BJP and Sev-Sena, still would win.
Anyhow, though I agree with you that Imran cannot force his party members to resign, but he can make them lose their parliamentary seats (as from my understanding of 18th Amendment). What Imran has to do is, take away PTI membership from them, and then send their name to speaker.
From my understanding of new law, a person would lose assembly seat if that person resigns from the party on whose ticket he contested election or stop being member of the party on whose ticket he contested election. Actually, a parliamentarian who got elected on the ticket of a party, new amendment accepts that the seat belongs to party and not the member, thus the person cannot change party nor be a parliamentarian if that person is not in the party whose ticket that person has used to contest election. If I am wrong then please let me know. Thanks