National Poll: Sanders overtakes Biden, Bloomberg surges to third; Poll: Bloomberg second to Biden among African-Americans; Atty Gen Barr: Justice Dept receiving Giuliani's Ukraine info; Global death toll from coronavirus tops 1,000; After Iowa caucus cha

AG Barr: Justice Department attempting to verify Giuliani's claims about Bidens' dealings in Ukraine; 2020 Dems sharpen attacks on eve of crucial primary; Sanders and Buttigieg ask for partial recanvass in Iowa; Sen. Graham defends firing of impeachment witnesses; Trump launches fresh attacks on Senators who voted to convict on articles of impeachment; Sources: Impeachment witnesses were planning quiet exit before Trump ordered public firings; Sen. Graham defends firing of impeachment witnesses, accuses officials at CIA, FBI and DOJ of going after Trump;

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