For the Democrats, it’s been a short, slippery slope from demanding Trump’s impeachment to likening him, ICE, and all Republicans to Nazis. Trump “is impeached forever,” declared Nancy Pelosi, voicing an accidental truth after Democrats impeached Trump for his phone call with Ukrainian President Zelensky. What Ms. Pelosi meant to say was that it did not matter whether Trump was or was not convicted, or even if the charges against him had merit. She had left her mark. The stain of impeachment would last forever. That’s what Speaker Nancy Pelosi meant. She laughed and smiled as she asserted that it...