But there is more to the story. Should the whistleblower have connections to prominent Democrats, exposure of his identity could be embarrassing to the party. And perhaps most of all, reading through the impeachment inquiry depositions that have been released so far, it’s clear that cutting off questions that could possibly relate to the whistleblower has also allowed Democrats to shut off any look at how the Trump-Ukraine investigation started. Who was involved? What actions did they take? Why did some government employees think President Trump’s July 25 call to Ukrainian President Volodymyr Zelensky represented a lost opportunity, or poor judgment, while others thought it represented wrongdoing requiring congressional investigation?

Democrats do not want the public to know. And in that, their position is familiar to anyone who has watched Washington for the last two years: The Democrats’ determination to cut off questions about the origins of the Trump-Ukraine investigation is strikingly similar to their determination to cut off questions about the origins of the Trump-Russia investigation. In both cases, they fought hard to keep secret the origins of investigations that have shaken the nation, deeply divided the electorate, and affected the future of the presidency.