El Pais interview:

Q. Are you considering stepping down once the party is in orbit?

A. Yes, for two reasons: because politics is temporary and because one should always be ready to do the organization’s bidding. I am under constant evaluation and I am ready to stop the moment I am told to. I want to be prime minister, and that involves an availability of four to eight years, but that can also be reviewed.

(El Pais)