Gordon D. Sondland, the United States ambassador to the European Union, told impeachment investigators he knew “nothing” about a quid pro quo in Ukraine.

Now Mr. Sondland, a blunt-spoken hotelier, has changed tack. In a new four-page sworn statement released by the House, he confirmed his role in communicating President Trump’s demand that Ukraine investigate the Bidens in exchange for military aid.

Today, we discuss the road to Mr. Sondland’s sudden reversal, and what his new testimony means for the impeachment investigation.

Guest: Michael S. Schmidt, a Washington correspondent for The Times who covers national security and federal investigations. For more information on today’s episode, visit nytimes.com/thedaily.

Background reading:

• Mr. Sondland’s reversal offers a potentially critical piece of evidence to investigators trying to determine whether Mr. Trump abused his power.
• Late-night show hosts mocked Mr. Sondland, saying he had reversed his testimony after remembering “one important detail: that I don’t want to go to jail for perjury.”