https://www.reuters.com/article/us-sprint-m-a-t-mobile/testimony-begins-in-u-s-states-lawsuit-to-block-t-mobile-sprint-deal-idUSKBN1YD10D >Witness testimony began Monday over an effort by U.S. state attorneys general to stop T-Mobile U.S. from buying Sprint Corp , in a case that highlights disagreements between federal antitrust enforcers, who are Republican, and Democrats in powerful states.