Trump could easily beat this. All he has to do is say this:
"At the time I really did not think there was anything really that wrong with my request of the Ukraine. But I've been listening to folks since then and I have to say, in retrospect I just made a mistake. I regret it and would like to turn my attention to working with the Congress on critical every day problems, such as trade, infrastructure and immigration reform. I have invited Speaker Pelosi to the White House so that I can personally apologize about the Ukraine matter and to lay out areas of possible agreement on these other issues."
He'd knock 20 points off support for impeachment and put her on the defensive.