The Lead with Jake Tapper
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Chief Justice, Senators sworn in for Trump impeachment trial; House Democrats call on Senate to hear evidence from Giuliani associate in impeachment trial; Trump: Senate trial "should go very quickly";
House managers formally present articles to Senate; Senate expected to vote on whether to call trial witnesses; John Dean: I'd be astounded if Senate doesn't call witnesses; Senate impeachment starts as Giuliani associate implicates Trump; Ukraine's FM: I