Arresting and sending all of Congress to Gitmo will immediately collapse the stock market. It would be the biggest/fastest drop in history. Probably drop 95% overnight.
There would be mass riots and civil unrest like never seen before, power blackouts, food shortages, looting, etc.
If it happens, its going to look like Armageddon for a while so if you really believe he's going to arrest nearly the entire government be prepared and stock up on food/water.
I'm... not so sure about that stock market collapse. Big Tech and the MSM will take a shit, but I think you'll see small businesses fling their doors open in relief, and the flow of money will be felt throughout the market.
Shit'll still suck for a while, the market will tale a hit, bit not as big of one as you think.
My hope is those arrests includes MSM and big Tech.