David Chalian breaks down day one of former president Donald Trump's second impeachment trial, where the constitutionality of trying an ex-president was up for debate. We saw some convincing arguments and moving speeches on the Senate floor today... and some bizarre, incoherent speeches as well. Overall, it was an emotional day at the Capitol as lawmakers were forced to relive the violent events that took place on January 6th. To learn more about how CNN protects listener privacy, visit cnn.com/privacy