(Portland, OR) -- Portland Public Schools is asking the state of Oregon to give it the funding it needs to fulfill the demands of striking teachers who hit the picket lines yesterday. PPS Superintendent Guadalupe Guerrero tells KATU-2 "the state of Oregon is not funding what they themselves have identified as a quality education for Oregon students." The district says the teachers union is calling for changes that would cost 220-million dollars more than it currently has in its budget. The Portland Association of Teachers called for a strike Tuesday night following months of failed contract negotiations. The union says the district's final offer did not make any "real investments" to "build safe, properly maintained and fully resourced schools in every neighborhood.