A look back at the 2016 election has become a criminal probe. The Justice Department is examining a matter of interest to the president - the origins of an investigation of his campaign. What's at stake as that investigation changes? Former national security adviser John Bolton was portrayed as unconventional, even dangerous. How did he become the one pushing back against the president and what role did he play as the White House pressed Ukraine? And Iraqi police fire tear gas at protesters. How did so much protest and so much violence grow out of simple demands for a return to "normal life"?