Chandigarh: Drawing parallels with West Bengal, where changing demographics due to illegal Bangladeshi infiltration became a matter of national concern, BJP national president Nitin Nabin on Monday said Punjab’s worsening law and order situation, rising gangsterism, drug menace and reckless migration of youth had similarly become issues of serious concern for both the state and the nation. Monday marked Nabin’s last day of his maiden three-day v…