You said that twice. It would help us if you could explain what you think it means, and how it differs from what you perceive as MachineShedFred's understanding.
I said it twice, because they invoked it as if it were a magic spell twice.
In order to say how it differs from MachineShedFred's understanding, he'd have to have explained what that was.
All I can say is that what he thinks certainly doesn't match reality if he thinks that due process is violated by the arrest.
First problem, is that he's mixing up procedural due process, and substantive due process.
Second problem, is that Congress has explicitly limited the due process of people who are here illegally (Illegal Immigration Reform and Immigrant Responsibility Act (IIRIRA)) under certain circumstances.
An example of a due process violation that would be unquestionable, would be if they were engaging in indefinite detention (effectively suspending habeas corpus), unless the court found he could legally suspend habeas corpus in this instance (which it almost certainly wouldn't- not even this Supreme Court, I don't think)
i.e., due process claims are largely overblown, and greatly misunderstood.
To be crass, black-bagging an immigrant off the street if you have reason to believe they are eligible for expedited removal is not a violation of their due process rights.
Putting them in prison indefinitely is.
Are you saying the Feds can break the law, and get away with it because of supremacy and qualified immunity?
That's a loaded statement.
I'm saying it's not illegal for those reasons, not that they can break the law for those reasons.
Transferring an arrested person from the point of arrest to a detention center with good faith belief that they have been involved in a crime is not unlawful, as long as the finding of good faith is held by the court.
Supremacy clause says that the Constitution and its laws are the supreme law of the land, which means that no law that doesn't explicitly remove qualified immunity (and is found to be constitutionally doing so) can make what they did illegal.
This might sound weird to you- but it makes perfect sense.
It is not reasonable to say that officers, doing their job, under orders assumed to be lawful, are criminals.