CNN The Lead w/ Jake Tapper

New CNN poll: 51% think Trump should be convicted & removed; More women say Trump should be removed than men; 86% of African American voters favor Trump's removal; Majority of voters under age 45 support Trump's removal; 69% want witnesses at president Trump's trial; 48% of republicans want witnesses at the trial; 58% say Trump abused power of the presidency; 57% believe Pres Trump obstructed congress; Pres Trump's approval rating at 43%; 45% say impeachment won't affect Trump's 2020 chances; Swing state voters split on removing Trump from office; WH legal team: impeachment articles "fail to allege any crime", appropriate for Trump to bring up Biden's & Burisma with Ukraine president; Source: fight over Trump trial could play out in open session; Sen. Doug Jones on looming impeachment trial; Trump visits Martin Luther King Jr memorial in DC; Sanders slams Biden's Social Security record ahead of Iowa; Biden: a Warren, Sanders nomination may hurt down-ballot Dems; NYT editorial board endorses both Klobuchar & Warren; High security as heavily armed protesters rally for gun rights; Despite concern, thousands protest peacefully for gun rights; Aircraft carrier named for African-American pearl harbor hero

Sources: House Republicans no longer expected to defend Trump in impeachment trial; Sources: Trial expected to start with contentious day with Democrats trying to force witnesses; Pompeo says State Department will investigate possible surveillance of ex-U.S. Ambassador; Indicted Giuliani associate says he watched Trump order aide to fire U.S. Ambassador to Ukraine in 2018; Eleven troops being treated for concussion symptoms, transported from Iraq to Germany and Kuwait; Defense Official to CNN: Symptoms emerged days after the attack; Iran's Supreme Leader says U.S. was slapped in the face; Trump: Impeachment trial is "rigging the election again against Bernie Sanders"; Trump knocks Bloomberg campaign Ads as "vanity project"; Biden to NYT Editorial Board: "Not true" I hinted willingness to serve only one term; FBI arrests three alleged white supremacists ahead of gun rights rally in Virginia; New book: Trump "dressed down" top military officials in 2017 meeting, called them losers; 

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; 

Rep. Amash reacts to Pelosi's picks for impeachment managers; Yovanovitch wants investigation into "disturbing" surveillance; New letters: Giuliani had Trump's "knowledge and consent" to request meeting with Ukraine president; Klobuchar: there's a double standard for women in politics, but I can win presidency; Warren-Sanders feud takes center stage at CNN debate; Biden & Sanders spar over Iraq war vote during CNN debate; Candidates make final cases to Iowa voters during CNN debate; WH undecided on including Trump defenders in trial; Trump signs first phase of trade deal with China on the same day house delivers impeachment articles; Dow closes about 29k for first time as Trump signs phase one of trade deal with China; Any moment: Pelosi to sign article of impeachment;

Some GOP Senators open to impeachment process; Sen. Paul: GOP may have to call Hunter Biden in trial; Trump supposed to be in Davos during start of impeachment trial; McConnell slams Pelosi for delaying impeachment trial; McConnell: Impeachment trial to start on Tuesday; Sen. Paul: If witnesses are allowed, I'll call for Hunter Biden; McCarthy: By holding articles, Pelosi helps Biden's 2020 bid; Sanders attacks Biden's Iraq war vote ahead of CNN Debate; Biden touts electability against Trump in new Ad; DNC Chair defends process over concerns about diversity; Warren aide: Not looking for a fight with Sanders tonight; New Biden Ad: Trump has Joe Biden on the mind; Barr & Pompeo shift justification for Iran strike; Trump on imminent threat: "It doesn't really matter"; Russia accused of hacking company at center of impeachment; Burisma hack seems to mimic Russia's 2016 election interference; Cyber firm: Russia began hack at height of Trump's impeachment; Schiff: Russia is at it again, trying to help Trump; Biden Campaign: Hack proves Putin & Trump see Biden as threat; Pelosi demands Trump Admin brief Congress on Burisma hack;