https://sharylattkisson.com/2019/10/who-is-the-whistleblower-thats-trying-to-take-down-trump/
If the reporting is correct, it implies the “whistleblower” could have been worried Trump was getting close to uncovering Democrat links to Ukraine’s interference in US elections in 2016.
So I saw this and allegedly this all goes back to Michael Flynn. Flynn claimed the Russians had Hillary emails in 2015 based on his associates, some people named the Leedens, and he could get them because he has so many Russian connections and Trump ran with it. Trump also that the Ukrainians and/or the Russians had his emails at that time also.
The Russians apparently gave Flynn the run around while moving on the Trump campaign and Manafort was brought in for his Ukrainian connections. It he was another Russian agent, same as Flynn.
Trump allegedly believed at one point Hillary was being blackmailed by the Ukrainians with her emails even though Mifsud was saying the Russians had Clinton’s emails.
The whole thing is a mess. None of this stuff is true or even plausible but it got the Russians into the trump campaign and the rest is history.