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The nation's chief broadcast regulator is, once more, at the center of President Trump's culture war after the president launched a social media barrage Sunday night against ABC and NBC.

While the Federal Communications Commission has historically operated with a degree of independence from U.S. presidents, its new chair, Brendan Carr, has muscularly followed Trump's lead.

Carr has launched formal reviews of nearly all the major broadcast networks — ABC, CBS, NBC, NPR and PBS . He has also initiated investigations into the diversity, equity and inclusion actions of the corporate parents of ABC and NBC — the Walt Disney Co. and Comcast, respectively.

One network has so far escaped his scrutiny: Fox, which is owned by Trump p

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