[TigerClaws]

That was probably a Democrat group building negative press.

Remember there was a pro Cruz group robo dialing against Rubio IN SPANISH in a white state?

Dirty tricks.

They did this in MS to the Tea Party candidate.

[Cboldt]

American National Super PAC, American Freedom Party, William Johnson

White Supremacist PAC Inundates Vermont With Robocalls For Trump | Vermont Public Radio | Feb 25, 2016

Cruz likely knew all this, and just wanted to taint an opponent using false association / false witness.

[Cboldt]

-- That was probably a Democrat group building negative press. --

Doesn't look like it, at least not by any outward appearance. This group has been around for a decade, and is openly white supremacist.

Johnson says the call isn't a false-flag operation devised by Trump's opponents to smear the candidate's reputation of public perception. The organization, he says, is earnest in its support.

Later parts of the linked article impugn Trump for not being forthcoming with a particular disavowal.