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 don't trust a word Parnas is saying; Ukraine launches investigation after text messages suggest surveillance on former U.S. Ambassador; Lawyer releases video showing Trump with Parnas at Mar-a-Lago; GAO: Trump Admin broke law by withholding Ukraine aid; Trump (again) insists he doesn't know Parnas after explosive claims implicate him in Ukraine scandal; Trump claims no knowledge of Rudy Giuliani letter to Zelensky; Giuliani associates says Ukraine scheme "all about 2020"; Trump still faces GOP challengers for the presidency despite many states cancelling GOP primaries; Buttigieg blitzes Iowa as impeachment trial takes four Senate Democrats off campaign trail; Impeachment trial takes four 2020 Dems off campaign trail; Sanders on impeachment trial: I'd rather be campaigning but I swore an oath; New Buttigieg Ads target Iowa counties Trump flipped; Source: Intel Officials don't want public hearings on worldwide threats after angering Trump last year; Putin's handpicked new PM takes over today after entire government resigns; Putin appears to cement grip on power by changing rules of Russian constitution;
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The Lead with Jake Tapper