Erin Burnett Outfront

Key impeachment witness Gordon Sondland fired; On same day witness Lieutenant Colonel Vindman & brother fired; Trump adviser on impeachment firings: "Flushing out the pipes"; New poll shows Sanders, Buttigieg in tight race in New Hampshire; Biden Campaign downplays expectations in New Hampshire; Biden promotes Obama veteran in staff change after Iowa loss; Some Sanders fans using hostile tactics to drown out critics; Soon: Democrats to face off in debate ahead of New Hampshire Primary via Knit