Scott Adams has observed that Donald Trump puts himself in positions where he can win either way.
Impeachment is like that.
In the last week, he's said he would testify to Congress and he welcomes impeachment.
What do Democrats do?
They had to assume Trump would not want to be impeached, so they could safely impeach him.
Now he says, go ahead and impeach.
So if they vote to impeach Trump, they are actually doing his bidding.
Whatever they decide, he wins.