Here is a reminder of what was said it Nadler way back in the fall. This article exposes their plan and his has nothing to do with accountability.
"He (Nadler) also predicted that Democrats would frame their investigations as part of an effort to hold Trump 'accountable' rather than as a prelude to impeachment, because the public would find it more palatable that way."
https://www.dailymail.co.uk/news/article-6365379/Top-House-Democrat-spends-train-ride-talking-phone-impeaching-Trump-Kavanaugh.html