Article continues below advertisementJimmy Kimmel isn't backing down.After President Donald Trump and Melania Trump publicly called for ABC to fire the late-night host over a controversial joke, Kimmel responded on-air with a blunt defense, turning the backlash into his latest monologue target.The controversy stems from a line Kimmel delivered during a mock White House Correspondents' Dinner-style segment, where he joked about the first lady, saying, "Mrs. Trump, you have a glow like an expectant widow.