A federal court is hearing arguments over the Trump administration's use of the California National Guard in Los Angeles is underway. MSNBC Legal Correspondent Lisa Rubin, former Senior Executive in the FBI Counterterrorism Division Christopher O’Leary and senior director of the Brennan Center's Liberty and National Security Program Elizabeth Goitein joins Katy Tur to discuss. "For more context and news coverage of the most important stories of our day click here: https://www.msnbc.com/ »