1
general::
Introduce unnecessarily or forcefully. For example, The defense tried to drag in every scrap of evidence, relevant or not. [Mid-1800s] Also see LOOK LIKE SOMETHING THE CAT DRAGGED IN.
American Heritage Idioms
2
general::
Phrase(s): drag someone in (on something)
to force someone to join something or participate in something. • Don’t drag me in on this. • Let’s try to drag in some of the others on this.
McGrawhill's American Idioms And Phrasal Verbs