evidence: Former President Donald Trump said immigrants coming to the U.S. are "poisoning the blood of our country," a remark on Saturday that quickly drew a rebuke from his chief Democratic rival as President Joe Biden’s campaign likened the words to those of Adolf Hitler. [...] Chris Christie, one of Trump’s rivals for the Republican presidential nomination, called Trump’s remarks "disgusting" on CNN’s "State of the Union." [...] Trump has made criticizing the handling of America’s southern border a focal point of his campaign and frequently talks about the flow of immigrants into the U.S.