Argentine unions and social organizations, including workers, teachers and women, have called for a mass three-day protest against the government of President Mauricio Macri in what's set to be the largest demonstration against the administration since it took office 15 months ago. Macri returned Saturday to Argentina from a trip to Spain, where he held meetings with King Felipe VI and Prime Minister Mariano Rajoy and also delivered a speech in Congress. Members of the leftist party Podemos criticized Macri's visit, and one lawmaker greeted him with a shirt demanding the release of Milagro Sala , the Indigenous activist and lawmaker who was dubbed the first "political prisoner" of Macri's administration when she was arrested after a protest in January 2016. Teachers from all over the country will skip work and strike on March 6 and 7 — the first days of the school year — to protest wage disputes that have not been resolved with the adminis