From your link:
Barry H. Berke, a New York-based white-collar defense lawyer, has served as the special oversight counsel to the committee since February, working to build the investigative framework that now appears destined to end in the impeachment of Mr. Trump. On Monday, he will take a rare turn at the witness table to present for 30 minutes the facts before the committee and how they square with the law.
So, Barry Berke has been working on impeachment since February and the only charges that have come up are in the Ukraine matter? It's almost as if it was an investigation searching for a crime.