Joe Biden has taken the lead in states like Georgia and Pennsylvania in large part due to mail-in ballots. Trump has challenged the votes through lawsuits. Election workers received threats. WATCH NIGHTLINE EPISODES: https://abc.go.com/shows/nightline ALSO AVAILABLE ON HULU: https://hulu.tv/2wSmSrZ #Nightline #PresidentTrump #Biden #Election2020 #Politics