A court development is unfolding in the 'caso Leire Díez'. Cristina Narbona has been summoned to testify as a witness. The summons is set to take place on a specific date.

According to available information, Cristina Narbona is expected to appear before the court on 10 de julio. Further details about the case and the upcoming testimony can be found in the original source, El País. For more information on the 'caso Leire Díez' and Cristina Narbona's involvement, readers can refer to the source.