Mark Meadows, Trump's former chief of staff, will testify before a grand jury after securing immunity from special counsel Jack Smith, sources told ABC News. READ MORE: tinyurl.com/mv2hjmhh SUBSCRIBE to ABC News on YouTube: bit.ly/2vZb6yP Latest updates: abcnews.go.com Watch FULL EPISODES on Hulu: abcn.ws/3bzvQQn #news #markmeadows #trump #immunity #abcnews