Sources tell CNN that federal prosecutors are using a second grand jury in south Florida and have heard testimony from multiple witnesses as part of the investigation into former President Trump’s handling of classified documents. Another witness is expected to testify tomorrow at a federal courthouse in Miami with at least one other witness expected after that. There’s been a grand jury in Washington, DC to help gather evidence and witness testimony so it’s unclear why the special counsel is using a special grand jury in Florida. CNN Chief Correspondent Kaitlan Collins joins AC360 to discuss how Trump and his allies are reacting to the news of this second grand jury. Plus, former New Jersey governor Chris Christie kicked off his 2024 presidential campaign with some sharp attacks against Trump calling him a “lonely, self-consumed mirror hog” who, by force of personality alone, represents a threat to the republic. CNN Senior Political Analyst Gloria Borger spoke with Christie’s senior adviser. She tells Anderson Cooper what the former New Jersey governor’s lane will be in this crowded field of candidates.To learn more about how CNN protects listener privacy, visit cnn.com/privacy