Whistleblower complaint about President Trump involves Ukraine, according to two people familiar with the matter

A whistleblower complaint about President Trump made by an intelligence official centers on Ukraine, according to two people familiar with the matter, which has set off a struggle between Congress and the executive branch.

The complaint involved communications with a foreign leader and a “promise” that Trump made, which was so alarming that a U.S. intelligence official who had worked at the White House went to the inspector general of the intelligence community, two former U.S. officials said

Two and a half weeks before the complaint was filed, Trump spoke with Ukrainian President Volodymyr Zelensky, a comedian and political newcomer who was elected in a landslide in May.

That call is already under investigation by House Democrats who are examining whether Trump and his attorney Rudolph W. Giuliani sought to manipulate the Ukrainian government into helping Trump’s reelection campaign. Lawmakers have demanded a full transcript and a list of participants on the call.
Anyone following this? I don't even know where to start with this story, but this article is the latest, and has links to earlier stories. It's pretty convoluted and terribly alarming, but not surprising. The White House is trying to bury this story, fighting efforts by Democrats to get information.