NBC New York reports:
As Trump's rivals ratcheted up their criticism, a pro-Rubio super PAC also announced plans to start running new Trump attack ads in key states Friday morning.
One of the ads charges that Trump "knows nothing about foreign policy." Another targets his business background, highlights the businessman's use of "sleazy bankruptcy laws to avoid paying workers" and highlights his recent comment that he loves "the poorly educated."
The ads are part of a "significant part of a multi-state, multi-million dollar buy," said the pro-Rubio group's spokesman, Jeff Sadosky.