Yesterday, we looked at the origins of President Trump’s baseless theory that Ukraine, not Russia, meddled in the 2016 election. This theory inspired one of the two investigations he sought from Ukraine that triggered the impeachment inquiry. Today, we look at the origins of the president’s second theory. Guest: Kenneth P. Vogel, a reporter in The New York Times’s Washington bureau. For more information on today’s episode, visit nytimes.com/thedaily.  Background reading:Former Vice President Joseph R. Biden Jr.’s diplomatic record on corruption in Ukraine contradicts President Trump’s claims.There are a lot of accusations flying back and forth between the president and the former vice president. Let us help you sort them out.