October 19, 2019: The Ukrainian Candidate

"I would like to find out what happened with this whole situation with Ukraine, they say CrowdStrike. I guess you have one of your wealthy people. The server, they say Ukraine has it... I would like you to get to the bottom of it."
Portion of phone call transcript
President Trump to Ukraine President Zelensky, 25 July, 2019

"Rudy was one of many people that was incensed at the corruption that took place during that election. Pure corruption. For instance, I still ask the FBI, 'Where is the server?' How come the FBI never got the server from the DNC? Where is the server? I want to see the server. Let's see what's on the server. The server, they say, is held by a company whose primary ownership individual is from Ukraine. I'd like to see the server. I think it's very important for this country to see the server. Nobody wants to see it."
President Trump, 16 October, 2019
Open press event with Italian President

"Did he [President Trump] also mention to me in past [or passing] the corruption related to the DNC server? Absolutely, no question about that."
Mick Mulvaney, 17 October, 2019
James S. Brady Press Briefing Room

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I shall now attempt to parse this information and try to make sense of it. I do not proceed from partisan bias and I will not make any personal judgments.

"I would like to find out what happened with this whole situation with Ukraine, they say CrowdStrike."
What is CrowdStrike and who are they? I don't know who they are, but CrowdStrike is a cybersecurity technology company based in Sunnyvale, California. It provides endpoint security, threat intelligence, and cyberattack response services. The company has been involved in investigations of several high profile cyber-attacks, including the Sony Pictures hack, the 2016 Democratic National Committee email leak, and the Democratic National Committee cyber attacks.
Wikipedia

"I guess you have one of your wealthy people."
Trump may be referring to CrowdStrike co-founder Dmitri Alperovich, a U.S. citizen who was born in Russia.

"The server, they say Ukraine has it... held by a company whose primary ownership individual is from Ukraine."
The only source for this claim can be found on internet message boards and social media postings. I could find no credible evidence for why the DNC server is in the Ukraine.
Wikipedia

"I still ask the FBI, 'Where is the server?... I want to see the server.'"
It would seem President Trump suspects the FBI may have possession of the DNC server.

"Did he also mention to me... the corruption related to the DNC server?"
What is the corruption related to the DNC server? There is a conspiracy theory being pushed forward involving the 2016 Presidential election. The theory tries to cast doubt on Russia's role in the 2016 hacking of the Democratic National Committee. The proponents of this theory claim the DNC server hack was a setup by "The Deep State" to ruin Trump in favor of Mrs. Clinton. The Intelligence Community, The Mueller report, and the Senate Intelligence Comittee have concluded that it was Russian active measures that were responsible in the 2016 election interference.

Is that all? No. The President's administration, the Departments of Justice and State, are right now conducting an investigation into the Ukraine scandal and the origins of the Russia investigation. I say fine and good luck, but do so with honor and disclose to the American public what you find.

Breaking News, 23 November, 2019: Intelligence officials recently briefed senators and their aides on Russian efforts to pin interference in the 2016 U.S. election on Ukraine. The CrowdStrike theory is a Russian-backed disinformation campaign. CrowdStrike is not and has never been owned by a Ukrainian oligarch.
Axios on NY Times Report