Ted Cruz is making a splash on television in South Carolina, with a series of cutting new ads that ridicule his opponents -- including Donald Trump.
One spot is set in a children's playroom. "Look, I've got the Trump action figure!" a boy says. "What does he do?" another chirps. "He pretends to be a Republican!"
The 30-second commercial ends with the boy bashing a dollhouse with the Donald Trump figure and screaming "eminent domain" as horrified parents peek into the room.
Trump responded to that and other ads on Twitter, writing that if Cruz "doesn't clean up his act, stop cheating & doing negative ads," he would sue over Cruz's standing to run for president.
Cruz was born in Canada to an American mother, which Trump has suggested may mean he's not a "natural born citizen" as required by the Constitution. Most legal scholars disagree.
Overall, Cruz's South Carolina ad buy amounts to about $2.2 million, according to advertising tracker Kantar Media's CMAG.