That would run foul of International human rights, geneva conventions as well. Exit control over masses is now illegal after Hitler stopped Jews from migrating out to kill them in German controlled areas.
That said, I welcome the move of the Government.
.
both you and us are running foul of human rights for decades, issuing visa to one religious group over other is discriminatory...having said that I dont think anyone in PAkistan cares about it...me just saying