News Wrap: Vindman retires, saying Trump blocked promotion

In our news wrap Wednesday, a key impeachment witness against President Trump is leaving the U.S. Army. Lieutenant Col. Alexander Vindman announced his retirement Wednesday, with his lawyer accusing Trump of blocking Vindman’s promotion. Also, more than 150 academics, artists and writers are warning about what they perceive as growing threats to free speech, in an open letter in Harper’s Magazine.