From his first days as president to his last, how Trump stoked division, violence and insurrection. FRONTLINE investigates Trump's siege on his enemies, the media and even the leaders of his own party, who for years ignored the warning signs of what was to come.

How Iranian-backed Shia militias are terrorizing Iraq. FRONTLINE investigates allegations that militias are threatening and killing critics with impunity and targeting U.S. interests. Also in this hour, how COVID is worsening Yemen's humanitarian crisis.