Five new state attorneys general – some of them Republican – have joined an antitrust lawsuit seeking to block the $6.2 billion merger of local TV station owners Nexstar and Tegna. The transaction, which technically closed March 19 after the FCC and the U.S. Department of Justice approved it, is a game-changer because it would create a giant entity whose stations would reach 80% of U.S. households. Federal law to this point has limited station reach by a single owner to 39% of households. DirecTV and eight state AGs sued to block the deal, and a federal judge backed the complaint, freezing the deal via a “stand-still provision” limiting integration efforts by the companies. AGs in Indiana, Kansas, Massachusetts, Pennsylvania, and Vermont were added to an amended complaint, according to California AG Rob Bonta. Nexstar says it will appeal the case. CEO Perry Sook said last week he expects the appeal to play out over several months.…