MADRID — Spanish Prime Minister Pedro Sanchez’s planned Socialist party (PSOE) shake-up was derailed Saturday when an appointee resigned over sexual harassment allegations.

Francisco Salazar quit his post in the party secretariat and called for an investigation, PSOE said, noting no formal complaints had yet been filed. Left-wing site elDiario.es reported a PSOE staffer accused Salazar of inappropriate comments, invitations, and offers to stay at his home while she worked under him at Moncloa Palace.

The scandal broke just as Sanchez was due to announce reforms aimed at restoring party credibility, already under strain from a separate corruption probe involving former PSOE official Santos Cerdan, who denies kickback charges.

At PSOE headquarters, party leaders faced jeers from protesters chanting “out!” as some allies questioned whether Sanchez’s measures would be enough.

Castile-La Mancha Governor Emiliano Garcia-Page called it one of Spain’s gravest political crises in decades, warning, “If leadership doesn’t offer solutions, it becomes part of the problem.”