Republican presidential candidate Donald Trump has repeated his claim he will stop eating Oreos, citing the biscuit maker's decision to close a plant in Chicago and move it to Mexico.

"I'm never eating Oreos again," Mr Trump said, before adding he would consider it if he could find some that were made in the US.

Oreo's parent company Mondelez International said last month it has decided to invest £82 million in building four new production lines at a plant in Mexico, which will replace nine older production lines at its Chicago plant.

That will mean the number of jobs at the Chicago plant will go from about 1,200 to about 600, said Laurie Guzzinati, a Mondelez representative. But the plant in Chicago will remain open.

Ms Guzzinati said the decision to invest in the Mexico plant came after discussions with union representatives for workers at the Chicago plant. She said the company determined the new production lines would cost £29m less per year in Mexico than in Chicago, and said labour was "one of many factors".

Ms Guzzinati noted Oreos continue to be made in some US plants, including in New Jersey, Oregon and Virginia.

Meanwhile, Mr Trump has opened up a new media feud, taking on another popular TV news personality as his appearances continue to draw big ratings.

Mr Trump engaged in a prolonged confrontation with Jorge Ramos, the Miami-based presenter for Spanish-language broadcaster Univision, during a news conference in Dubuque, Iowa.