WATCH: Tucker Carlson reacts to Elon Musk buying Twitter: ‘Tyrants are grieving’

"The tyrants are grieving," Carlson said.

"Free speech is extremely important to civilization. Are you triggered by that?" Carlson asked. "It's often hard to know who's on what side, so much lying. Who are the tyrants? They're anyone who is bothered by the idea that other people might get to talk. That is an unfailing test. It's 100 percent accurate. Would you allow people who disagree with you to talk? If you wouldn't, you were a tyrant and tonight the tyrants are grieving."

Carlson emphasized that the electric car mogul's purchase of Twitter is a "revolutionary posture" for freedom of speech, which was the main reason that Musk decided to purchase the platform.

"'I hope that even my worst critics remain on Twitter,' Musk wrote today on his new platform 'because that is what free speech means.' Now, that sounds like an entirely American sentiment, but in this atmosphere, that is a revolutionary posture," Carlson said. "Of the five companies that control the flow of virtually all information that is consumed by the citizens of this country, Twitter is by far the smallest of the group, but it doesn't matter. One platform going rogue is enough to break the monopoly. That means you now have real options for expressing yourself."

The Fox News host said that "Musk's purchase of Twitter is the single biggest political development since Donald Trump's election in 2016."

"It is certainly the most threatening challenge to the corrupt and incompetent leadership of this country. Now, that may not be obvious to everyone yet, but the people in charge certainly understand it. The scene inside Twitter's San Francisco headquarters when the Musk deal was announced was akin to the scene when Hillary Clinton lost the 2016 election," Carlson explained.

"It is the collective grief of people who thought they were going to be fully in charge, who totally believed they'd be able to rule without limit. Those people learned that actually other people get to talk too, and that realization is crushing to them," Carlson said. "It's the one thing they fear and that tells you everything about why those people should never be near power. People who want a monopoly on speech and thought, hate Elon Musk not because he's a racist. He's not, but because they can't control him."