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MIAMI (CBSMiami) -- A new robocall pushing for people to vote for Donald Trump is causing some controversy.

"Donald Trump is not a racist, but Donald Trump is not afraid. Don't vote for a Cuban. Vote for Donald Trump," the recording states.

The call - making rounds in Vermont and Minnesota - is by the "American National" super PAC, a white supremacist group.

The group says it's making the call on behalf of Donald Trump but has no connection to the Trump campaign.

A spokesperson for Marco Rubio says the robocall is "outrageous" and that Trump should demand that it stop.

Meantime,  former Republican nominee Mitt Romney is calling on the GOP hopefuls to release their tax returns.

Romney went on to say yesterday he suspects there's a "bombshell" in front-runner Donald Trump's tax returns that prompted Trump to call Romney a "fool" who lost a winnable race against President Barack Obama in 2012.

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