Mr. Trump’s public statements, plus testimony and documents introduced during the impeachment process and revelations independent from the congressional inquiry, establish a narrative of the president’s involvement in the effort led by Rudolph W. Giuliani, his personal lawyer, to persuade Ukraine to publicly commit to investigating two topics…

There are still unanswered questions about the details of Mr. Trump’s involvement, and additional information could emerge later.

But a review of thousands of documents and dozens of interviews reveals how Mr. Trump developed a bitter grudge against Ukraine and then became personally involved in pressuring its leaders. Evidence of Mr. Trump’s role comes from a variety of sources.