FRONTLINE investigates the roots of the federal criminal case against former President Donald Trump stemming from his 2020 election loss in a special audio version of the new documentary Democracy on Trial.  In part two, Georgia election official Gabriel Sterling issues a stark warning about the potential for violence. Rusty Bowers, former Arizona House speaker and a lifelong Republican, testifies in front of the Jan. 6 Select Committee about former President Donald Trump’s campaign of pressure on local officials. And two Georgia election workers, Shaye Moss and Ruby Freeman, face racist threats after being named in a conspiracy theory about stolen votes.  Tune in next week for the third installment of the audio-only version of the documentary here on The FRONTLINE Dispatch. Watch Democracy on Trial in full on FRONTLINE’s website, YouTube or the PBS App.