Spains far-left party Podemos, which helped the Socialists oust the conservatives and take power, accused new Prime Minister Pedro Sanchez of being "arrogant" for thinking "he could govern alone."
Sanchez, 46, ousted conservative premier Mariano Rajoy last Friday in a parliamentary no-confidence vote, sparked by corruption convictions against former officials of Rajoy's Popular Party (PP), which had governed for six years.