FRONTLINE investigates how El Paso, Texas became the Trump administration's immigration policy testing ground, and then the target of a white supremacist. Interviews with current and former officials, Border Patrol agents, advocates and migrants tell the inside story from the epicenter of the border crisis.

An investigation into America's increasingly bitter, divided and toxic politics. Part Two examines how Trump's campaign exploited the country's divisions, how his presidency has unleashed anger on both sides of the divide, and what America's polarization could mean for the country's future.