Who believes that that Caliph it may be any righteous Muslim?

The belief that the Caliph can be any righteous Muslim is primarily associated with Sunni Islam. Sunni Muslims hold that leadership should be based on consensus and the capability of the individual, rather than lineage or specific family ties, as seen in the Shia tradition. This perspective emphasizes the importance of the community in selecting a leader who embodies the qualities of righteousness and piety.