U.S. Education Secretary Linda McMahon and members of her staff exit a classroom at Exeter-West Greenwich Regional Junior High and High School in West Greenwich on Monday, Jan. 12, 2026. (Photo by Alexander Castro/Rhode Island Current)The nation’s largest labor union has sued the U.S. Department of Education over its decision last year to cancel 28 grants created to help teachers improve techniques for working with English-language learners. The…