Donald Trump delares that the USA is now at 'war' in order to deport people rapidly

Yet it's just a phony 'war'. Which country the USA is at 'war' with hasn't been defined to my knowledge but presumably it's Venezuela.

Trump is using the 1798 Alien Enemies Act that remains in force to this day.

Analysis of Trump's conduct and behavious makes it clear he himself isn't smart enough to work this out - he would have a team of researchers and advisors doing all the background stuff and trump just takes the glory by signing the applicable EO's.