Presumably they chose Signal because they don't want any oversight...

Still smells of bad government / covering their tracks, but also exactly what I would expect from folks in this administration.

Might be what they used prior to taking office, having not spent a career using systems approved for classified information.

Does anyone know what tool they used prior to this administration? I sure expected there to be a proprietary one.

I dont understand. Why is Trump and the others above the law?

Trump v. United States. He could theoretically be impeached but if Congress wasn't going to it after he kinetically attacked them, it's not going to happen.

Others: pardon power.