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>> this is the "cbs evening news" with norah o'donnell, reporting tonight from washington. >> o'donnell: good evening. and thank you for joining us on this extraordinary night in u.s. history. president trump tonight is accused of witness intimidation, and now faces another possible impeachment charge. never before has a president publicly attacked an impeachment witness at the moment they were testifying as mr. trump did today on twitter. it came during chilling testimony from marie yovanovitch, the highly respected diplomat and anticorruption crusader told congress she felt threatened and intimidated by president trump. yovanovitch said she was removed from her post in ukraine after being "knee-capped" by a shadowy smear campaign. democrats claim that takedown cleared the way for the president to attempt to bribe