Assalamu alaikum Sh Gibril,
May Allah bless you and family always.
May Allah bless you and family always. His friends want to gather and perform salatul hajat for him and make dua.
Is it permissible to make shalat hajat on someone who has left Islam?
Yes it is permissible, as the gates of tawba are open for him until his death or until the sun rises from the West, whichever comes first.
May Allah bless you and yours always.
Hajj Gibril Haddad