Disney’s decision this week to pull “Jimmy Kimmel Live!” from its broadcast network ABC is shining a light on a part of the media business over which the federal government has control. 

On Thursday, President Donald Trump suggested his administration should revoke the licenses of broadcast TV stations that he said are “against” him. Federal Communications Commission Chair Brendan Carr has made similar threats, including during a CNBC interview, also on Thursday.

It’s not the first time Trump or Carr has invoked the government’s power to pull a broadcast station license — putting an in-the-weeds part of the media business front and center for consumers, and flexing the government’s power over a major part of the industry. 

Let’s start with the basics: Networks such as Disney’s ABC, Paramount Skydance’s CBS, Comcast Corp.’s NBC and Fox Corp.’s Fox are part of a system that requires them to obtain over-the-air spectrum licenses from the federal government in order to broadcast these household-name stations. 

That means free, over-the-air service to anyone with an antenna on their TV. 

Pay-TV networks such as CNN, MTV or FX, for example, are considered “over-the-top” and available for subscription fees. They’re often bundled together and distributed by companies such as Comcast, Charter Communications or DirecTV. 

Broadcasters such as ABC are known for programming that includes local news, live sports, prime-time sitcoms and dramas, as well as late-night shows such as “Jimmy Kimmel Live!”

Although the way consumers watch these programs has significantly changed from the days of using an antenna for free viewership — now they’re often viewed via pay-TV bundles, plus the content is frequently found on streaming platforms — the model has remained largely the same. 

Companies that own local broadcast TV stations, such as Nexstar Media Group and Sinclair, license spectrum — or the public airwaves — from the government, with the FCC in control. 

Through this public spectrum for radio and TV stations, the federal agency has the right to regulate broadcasting and requires each network “by law to operate its station in the ‘public interest, convenience and necessity.’ Generally, this means it must air programming that is responsive to the needs and problems of its local community of license,” according to the FCC website.

In August, Trump accused networks ABC and NBC of being “two of the worst and most biased networks in history” and suggested revoking their broadcast licenses.

Carr earlier this year, freshly in his post as FCC chairman, reawakened complaints directed at ABC, NBC and CBS from the conservative organization the Center for American Rights. 

And in February, during a conversation at Semafor’s “Innovating to Restore Trust in News” summit in Washington, D.C., he suggested the agency would be looking closely at licenses. 

“If you’re going to have a license to be a broadcaster, it comes with something called ‘you have to serve the public interest.’ If you don’t want to do that, that’s OK,” Carr said during the summit. “I will give you the address of the FCC … you’re free to turn your license in and you can go podcast and you go over-the-top.” 

Nexstar is currently seeking government approval of a $6.2 billion deal to merge with fellow broadcast TV station owner Tegna, which would upend longstanding regulations for broadcast station owners. 

Sinclair has also said it’s looking to merge its broadcast TV station business with another competitor, although a deal has yet to be announced. 

While Nexstar and its peers have bulked up over the years through acquisitions, they’ve been subject to longstanding federal limits on the number of stations that these parent companies can own. 

Following Trump’s election in November, leaders of the station owners — as well as other media businesses — saw an opening for further consolidation and deals. 

The FCC’s Carr has also publicly said in recent months that he would support getting rid of broadcast station ownership rules and caps, paving the way for such deals, which could help salvage a business model that’s being disrupted. 

With the rise of streaming, the pay-TV ecosystem has bled consumers, and broadcast TV networks and local affiliates have also felt the effects. 

While the stations are free to air, distributors such as Charter pay the broadcasters so-called retransmission fees, on a per-subscriber basis, for the right to carry the stations. These lucrative fees heavily buoy the profits of companies such as Nexstar, which means dwindling pay-TV customers cuts into broadcast profits. 

Disclosure: Comcast is the parent company of NBCUniversal, which owns CNBC. Versant would become the new parent company of CNBC under a planned spinoff.