In his testimony, Mr. Taylor recounted in stark terms how he came to understand that U.S. policy in Ukraine was subject to a set of politically motivated preconditions demanded by the president. But he also conceded that he had never spoken directly with Mr. Trump.

“Mr. Taylor’s testimony gave us what might be the most detailed account yet of how and why Mr. Trump withheld military aid from Ukraine,” Noah Weiland writes in our Impeachment Briefing. (You can sign up here.)

Go deeper: Interviews in Kiev with government figures, lawmakers and others show how high-level Ukrainian officials decided to acquiesce to Mr. Trump’s request — but, by a stroke of luck, never had to follow through.

Related: Mr. Trump asked Attorney General William Barr to hold a news conference saying that no laws were broken in the call with Ukraine’s president. Mr. Barr declined.

Another angle: The president and his allies have used Twitter to frame his defense and attack key witnesses, including a decorated Iraq war veteran.