3. Mr. Kent described how Mick Mulvaney, the acting White House chief of staff, wielded power over Ukraine policy — it was Mr. Mulvaney, he said, who controlled the nearly $400 million in military aid designated for the country. “The head of the Office of Management and Budget who was the acting chief of staff, Mick Mulvaney, at the direction of the president, had put a hold on all security assistance to the Ukraine,” Mr. Kent testified.

4. Mr. Kent said that his own boss, Secretary of State Mike Pompeo, failed to back up Ms. Yovanovitch when she came under assault by conservatives. “It’s always most helpful if the top leader issues a statement,” Mr. Kent said. He also said Mr. Pompeo’s assertion that investigators were trying to “bully” diplomats into testifying was untrue. “I was one of two career foreign service officers which had received letters from the committees, and I had not felt bullied, threatened and intimidated,” Mr. Kent said.

Read the full transcript of Mr. Kent’s testimony to impeachment investigators, and more takeaways from our reporters.

How implicated is Mike Pompeo?

Mr. Pompeo, who was once the C.I.A. director, has been seen as one of Mr. Trump’s most durable allies in the administration, refusing to criticize his boss through years of investigations. I talked to my colleague Ed Wong, who wrote this week about Mr. Pompeo, to get a sense of where he stands in the impeachment inquiry.

Ed, how would you describe Mr. Pompeo’s role in what lawmakers are investigating?

What emerges from witness testimony and from what various other people, including Mr. Giuliani, have said is that Mr. Pompeo was an enabler — at the very least — of the shadow Ukraine policy.