Sanchez's confirmation as premier would end four months of uncertainty since an election in July produced no outright winner. Authorities said 15 people were arrested in a 2,000-person protest on Wednesday night outside the Socialist Party headquarters in Madrid following clashes with police. Feijoo, who accused Sanchez of undermining the rule of law on Wednesday called for mass protests on Saturday Nov 18. Sanchez argued on Wednesday that an amnesty would help to defuse tensions in Catalonia. Reporting by Belen Carreño and Emma Pinedo; Writing by Charlie Devereux; Editing by Sharon SingletonOur Standards: The Thomson Reuters Trust Principles.

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Persons: Pedro Sanchez applauds, amnesties, Catalonia's, Sanchez, Pedro Sanchez, Alberto Nunez Feijoo, Jorge Pueyo, Sumar, Patxi Lopez, Feijoo, Miriam Nogueras, Nogueras, Belen Carreño, Emma Pinedo, Charlie Devereux, Sharon Singleton Organizations: Spain's, Socialist, People's Party, Sanchez's Socialist Party, PSOE, ERC, Socialists, Authorities, Socialist Party, Thomson Locations: MADRID, Spain, Catalonia, Basque Country, Galicia, Madrid, Socialist