FCC Chairman Brendan Carr sent a letter to Comcast on Tuesday announcing a probe of the company's relations with NBC affiliates.

In a letter to Comcast’s CEO, Carr expressed concerns that NBC and other networks are attempting “to extract onerous financial and operational concessions from local broadcast TV stations”

The chair of the Federal Communications Commission is opening a probe into NBC-parent Comcast’s relationships with its local broadcast TV affiliates, the latest in a series of investigations into major U.