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In page Succession crisis (Latter Day Saints):

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On August 6, Brigham Young and the rest of the Twelve returned to Nauvoo; the next day, they met with Sidney Rigdon, who repeated his claim to become the guardian of the Church. Brigham Young responded, "Joseph conferred upon our heads all the keys and powers belonging to the apostleship which he himself held before he was taken away".[2] So while historically the First Presidency has previously led the Church, Young proposed an ad hoc Presidency of the Church in the Quorum of Twelve.[3] Young tried diligently to persuade the people that he alone held the rights to lead the Church. He even went so far as to ride through the streets on Smith's favorite horse named Joe Duncan.[3]