Asked if he still thought that UKIP voters are "closest racists, loonies and fruitcakes" the Prime Minister told ITV News: "We live in a competitive, political world and people make their choices. I'll choose my words carefully. I want people to support my party.
"I'll let people make up their own minds but at the end of the day, at the next election there is going to be a very straight choice. It will be a red, blue choice."
More top news
An Egyptian billionaire has offered to buy an island from Greece or Italy and develop it to host migrants fleeing war-torn areas.
The number of children having private tutoring has increased by more than a third in the last decade, according to a charity.
Girls should swap dolls for toys such as Lego and Meccano to get them more interested in science and engineering, top scientist claims.