Ezra Klein sums it up pretty well and, as far as I can see, he's completely correct:

The crisis is now. It is not six months away. It is not another Supreme Court ruling away from happening. It’s happening now.

Perhaps not to you, not yet. But to others. Real people. We know their names. We know their stories.

The president of the United States is disappearing people to a Salvadoran prison for terrorists. A prison known by its initials — CECOT. A prison built for disappearance. A prison where there is no education or remediation or recreation, because it is a prison that does not intend to release its inhabitants back out into the world. It is a prison where the only way out, in the words of El Salvador’s so-called justice minister, is a coffin.

On Monday, President Trump said, in the Oval Office, in front of the cameras, sitting next to President Nayib Bukele of El Salvador, that he would like to do this to U.S. citizens, as well.

Archived clip of Donald Trump: If it’s a homegrown criminal, I have no problem. Now, we’re studying the laws right now. Pam is studying. If we can do that, that’s good. And I’m talking about violent people. I’m talking about really bad people. Really bad people. Every bit as bad as the ones coming in.

He told Bukele that he would need to build five more of these prisons because America has so many people Trump wants to send to them….

Why do we need El Salvador’s prisons? We have prisons here. But for the Trump administration, El Salvador’s prisons are the answer to the problem of American law.

The Trump administration holds the view that anyone they send to El Salvador is beyond the reach of American law — they have been disappeared not only from our country but from our system — and from any protection or process that system affords.

In our prisons, prisoners can be reached by our lawyers, by our courts, by our mercy. In El Salvador, they cannot….

Politically, they cannot let Abrego Garcia out, nor any of the other people they sent to CECOT, without due process.

Because what if he was released? What if he returned to the United States? What if he could tell his own story? What if — as seems likely — he has been brutalized and tortured by Trump’s Salvadoran henchmen? Well, he can’t be allowed to tell the American people that….

To the Trump administration, Abrego Garcia [the man wrongfully deported to El Salvador] is not a mistake. He is a liability, and he is a test. A test of their power to do this to anyone. A test of whether the loophole they believe they have found — that if they can get you on a plane, they can hustle you beyond our laws and leave you in the grips of the kind of gulags they wish they had here.

They are not ashamed of this. They are not denying their desire to do it to more people.

This is how dictatorships work. Trump has always been clear about who he is and the kind of power he wants. Now he is using that power.