See, like so many people, you’re stuck in the mindset that Trump would have to go through the normal government process to get this all done. Trump’s whole thing is to lie, cheat and steal to get things done.
Here’s my scenario for fast-fascist concentration camps:
Every system of concentration camps we’ve ever seen have had some unique characteristic to them, depending on why the people in charge wanted the camps. What will be unique about these camps? For-Profit Concentration Camps.
Trump finds a few MAGA-loyal construction contractors spread out around the US, and tells them, “If you build it, they will come!” He spins them a tale of how he alone will pass legislation that guarantees $X per person for every person they can stuff into a camp. If they take out loans, or invest their own money, in advance of Congress actually passing the legislation, they will own the camps outright, and take all the profit for themselves.
And of course, they’ll be allowed to sell all that Free Labor to anyone they want, as well, so even if Congress drags their feet, which is of course a ridiculous notion, the Camp Commandants (that’s a name Trump just up with, can you imagine no one ever said that before?) will still be raking in that big slavery free labor money.
One of two things happen: this works, and they all laugh all the way to the bank, or it fails.
If it fails, Trump just nationalizes the camps as being essential to national security, and bingo-bango-bongo, he’s got fresh new concentration camps to play with.