Chief Justice John Roberts privately lobbied fellow conservatives to save the constitutional right to abortion down to the bitter end, but May’s unprecedented leak of a draft opinion reversing Roe v. Wade made the effort all but impossible, multiple sources familiar with negotiations told CNN.

It appears unlikely that Roberts’ best prospect — Justice Brett Kavanaugh — was ever close to switching his earlier vote, despite Roberts’ attempts that continued through the final weeks of the session…

Multiple sources told CNN that Roberts’ overtures this spring, particularly to Kavanaugh, raised fears among conservatives and hope among liberals that the chief could change the outcome in the most closely watched case in decades. Once the draft was published by Politico, conservatives pressed their colleagues to try to hasten release of the final decision, lest anything suddenly threaten their majority.

Roberts’ persuasive efforts, difficult even from the start, were thwarted by the sudden public nature of the state of play. He can usually work in private, seeking and offering concessions, without anyone beyond the court knowing how he or other individual justices have voted or what they may be writing.