Sinclair has been talked about now and then for a while for their right wingedness. John Oliver has some stuff on them and their control over local media markets.
Nexstar is sucking up as they want federal regulations removed, as they're at the legal limit for how many stations they can own to avoid a media monopoly. They want to merge with another local media company and double their amount of stations, giving them control of the majority of the country's local stations.
This is why these 2 groups are helping to try to take out the president's enemies.