Chief Justice, senators sworn in as Trump impeachment trial begins; Giuliani associate: "Of course" Vice President Pence knew about Ukraine pressure campaign

From The Situation Room with Wolf Blitzer and Pamela Brown CNN Podcasts

GOP Sen. McSally lashes out after question about impeachment evidence, calls reporter "a liberal hack"; Trump says "I don't know him" after indicted Giuliani associate implicates president in Ukraine scandal; Trump denies knowledge of Giuliani's letter seeking meeting with Ukraine president claiming Trump's consent; Government watchdog: trump administration broke law by withholding Ukraine aid; Trump says he'll be at Davos Economic Summit during impeachment trial next week; Giuliani associate: Push for Ukraine to investigate Biden was "all about" helping Trump win in 2020; Giuliani associate: trump knew exactly what was going on; Source: Wary of angering Trump, intel officials request no public hearings on worldwide threats; Ukraine investigating whether U.S. Ambassador was being tracked; FBI visits home, business of congressional candidate implicated by Giuliani associateTo learn more about how CNN protects listener privacy, visit cnn.com/privacy Learn more about your ad choices. Visit podcastchoices.com/adchoices