Here’s a good summary of the crimes committed by Trump and all in the Ukraine extortion attempt.
Trump Committed Crimes in His Ukraine Shakedown - Center for American Progress
President Donald Trump's impeachment defense team is set to argue that his impeachment does not involve any criminal…
And here is a legal review of the specific laws broken just in reference to Ukraine disaster:
Federal Criminal Offenses and the Impeachment of Donald J. Trump
Introduction: The Problem of Missing Witnesses and Documents for the Conviction of Donald J. Trump Andrew Weissmann…
And here is a summary of all witnesses in the impeachment investigation and what they testified to as criminal acts: