Elon Musk’s lawyers seek documents from former Twitter chief Jack Dorsey

- Subpoena is first sign the social-media firm’s co-founder will be an official part of the legal fight over Tesla CEO’s $44 billion takeover deal
Elon Musk’s lawyers have sent a subpoena to Jack Dorsey, the first indication that Twitter Inc.’s co-founder and former chief executive will be officially involved in the legal fight over Mr. Musk’s stalled $44 billion deal.