Mitt Romney says he worries that Donald Trump is promoting ‘‘trickle-down racism’’ and appealing to the racist tendencies of some Americans.

Mitt Romney says Donald Trump will change America with "trickle-down racism" https://t.co/nZ8IwvySEg https://t.co/Vi6qYQ6YpG — CNN Politics (@CNNPolitics) June 10, 2016

Romney, the 2012 Republican presidential nominee, says he will consider voting for the Libertarian candidate, Gary Johnson. Romney made the remarks in a CNN interview while hosting his annual politics and business summit at a ski resort near Park City, Utah.

Mitt Romney says he's not ruling out supporting Libertarian candidate Gary Johnson https://t.co/nZ8IwvySEg https://t.co/cl3VgBEoKL — CNN Politics (@CNNPolitics) June 10, 2016

Romney has been one of the most outspoken Republican Trump critics and continued hammering the presumptive nominee on CNN.

Of the billionaire businessman’s taxes, which Trump has refused to release, Romney says, ‘‘there’s something in those taxes that’s even worse than shooting someone on Fifth Avenue.’’

Mitt Romney on Donald Trump: "If he released his taxes, he'd lose support" https://t.co/nZ8IwvySEg https://t.co/hVeCg9CtCr — CNN Politics (@CNNPolitics) June 10, 2016


A spokesman for Trump says on CNN that Romney’s comments amount to ‘‘sour grapes.’’