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

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 associate

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