Trump is goading them to impeach.
Once they do, they’re no longer in control of the process or narrative.
Wouldn’t surprise me in the least that the Dems eventually do not impeach saying that they don’t want to waste their time as the Republican Senate won’t do their job, so why bother?
Yup - the President is telling the Democrats: “Yup yours!” He’s waving the red flag in front of the maddened bull.