They never mentioned Trump's name, but in the past week, two former presidents began building the case for Donald Trump as a growing problem for American democracy. "We've seen nationalism distorted into nativism," George W. Bush lamented in a speech in New York. "Bigotry seems emboldened." Barack Obama, appearing the same day in Virginia, likewise denounced "the politics of division", offering a frustrated reminder that "it's the 21st century, not the 19th century. Come on!". Read more of USSC research associate Dr Nicole Hemmer's latest op-ed for The Age.