"By late May, Justice Blackmun had fully joined the Douglas-Brennan circle [which also included Potter Stewart and Thurgood Marshall] in favor of creating an abortion right. [Memorandum to the Conference, dated May 31, 1972]. Justice Blackmun's memoranda reflect highly legislative considerations almost exclusively. For example, he proposes to invalidate most of the Georgia statute, except maybe those requiring an abortion to occur in a licensed and accredited hospital. [Memorandum to the Conference from Harry Blackmun, dated May 25, 1972]. Demonstrating that none of these specific invalidations were rooted in constitutional text or history, however, Justice Blackmun holds open the possibility, like a good legislative lobbyist, that may be "some of you may wish to take that step, too [that is, allowing abortions outside hospitals]." [Id., the Court did take that step.] The particulars of the Court's legislative considerations still tangled, Justice Blackmun, at month's end, urges that Roe and Doe be reargued. [Memorandum to Conference from Harry Blackmun, dated May 31, 1972]."
January 1, 1970
https://en.wikiquote.org/wiki/Roe_v._Wade