On Martin Luther King Jr. Day, ABC News contributors Tara Setmayer, LZ Granderson and Leah Wright-Rigueur reflect on the challenges President-elect Joe Biden’s administration will face. WATCH NIGHTLINE EPISODES: https://abc.go.com/shows/nightline ALSO AVAILABLE ON HULU: https://hulu.tv/2wSmSrZ #Nightline #PresidentTrump #Biden #Pence #Inauguration #Washington #CapitolHill #Impeachment #Politics