2020 Daily Trail Markers: Former Vice President Joe Biden slams Trump for escalating tensions with Iran

During a speech in New York City on Tuesday, former Vice President Joe Biden slammed the Trump administration for failing to provide evidence of an "imminent threat" from Iran that would justify the U.S.’s recent actions in the country. Meanwhile, Vermont Senator Bernie Sanders went after Biden for his foreign policy record. 2020 campaign reporters Cara Korte and Bo Erickson join CBSN for this edition of 2020 Daily Trail Markers.