Extremism expert calls attack an 'act of political theater' designed to propagandize white nationalism, as ADL head says anti-Semitism still rising

Remarks come after Biden makes president's 'very fine people on both sides' defense of white supremacists the center of his campaign launch

Newly announced Democratic candidate for 2020 election says president's comments made him realize 'the threat to this nation was unlike any I had seen in this lifetime'