you are live in the "cnn newsroom." i'm jim acosta in washington, good evening. with just over 24 hours until the caucuses, donald trump is delivering his closing arguments to the people of iowa, with a heavy dose of insults, mockery, and more lies. for his supporters, he's pledging four more years of revenge and retribution. >> nikki and crooked joe are backed by warmongers, millionaires and billionaires who crave to destroy the maga movement. these caucuses with your personal chance to score the ultimate victory over all of the liars, cheaters, thugs, perverts, frauds, crooks, freaks, creeps, and other nice people. >> trump blamed immigrants for the nation's problems, saying they threaten to spread disease all over the nation. here's part of that hateful,