Investigations galore, yes. Impeachment, no. Impeachment requires evidence. They have none and they know it. But long, drawn out investigations that give the appearance of wrong doing, even if there wasn't, that's politically useful.
It's also sabotage in wartime, if we're attacked after the investigations start.
I'd warn them first, then arrest the entire Dem leadership if we were atacked.
They might not even want too many investigations, as the truth might find a way out. They just like to talk smack to their nutty base. What they will do is stop things like nominations/confirmations, no one will get a vote. Say goodbye to any judges or other appointments.