The president of the South American nation, Santiago Peña, has apologized for failing to prevent its worst financial crisis in decades.

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Prime Minister Pedro Sánchez wanted to campaign on inequality and housing, but the second major rail accident this year has put his government’s competence on trial.

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Santiago Schnell, who had been provost since last year, will leave after a review found that he had improperly used A.I. in published opinion articles.

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