CBS News is shutting down CBS News Radio and laying off about 6% of its entire workforce, with executives explaining the cuts as a difficult but necessary reallocation of newsroom resources.

The California attorney general is coordinating his antitrust review of the roughly $110 billion sale with at least one other state attorney general: Letitia James of New York.

State officials are looking to take up antitrust challenges against potentially massive media mergers if the federal government does not.