Donald Trump’s rhetoric dropped to a spine-tingling new low this weekend with less than a month before the Iowa caucuses.The GOP primary front-runner said migrants are “poisoning the blood” of the US and quoted Russian President Vladimir Putin about the “rottenness” of American democracy.Whipping up thousands of supporters at a New Hampshire hockey rink on Saturday, the former president again drew comparisons to the language of Nazi Germany with the comments about migrants from mostly Africa, Asia and South America “poisoning the blood of our country.”The language “parrots Adolf Hitler,” President Joe Biden’s reelection campaign alleged. Experts pointed to passages...