Donald Trump says he is the victim of a "double standard" after comments he made about Carly Fiorina's looks - pointing out that she has also made remarks about the appearances of her female rivals.

On Hannity on Thursday night, he said Fiorina had called California Senator Barbara Boxer's hair "so yesterday" during her failed Senate bid in 2010.

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Hannity asked: “Do you think there's a bit of a double standard in terms of people make fun of you all the time?”

Trump said: “Well, it’s not only a double standard, it's being politically correct. Last night I was very nice to her [during the debate] and some people thought I was being sarcastic.

“But actually if you look back at the records on Carly, she was brutal on Barbara Boxer. She was very nasty. She was running against Barbara Boxer. She lost in a landslide but during the run she was really horrible about Barbara Boxer's looks."

The billionaire added: “She’s playing the game herself.”

Fiorina was caught making the remark on a microphone.

When Greta Van Susteren asked her about the incident, Fiorina said, “I was quoting a friend of mine. My goodness, my hair's been talked about by a million people, you know? It sort of goes with the territory.”

Read: Trump Insults Carly Fiorina: 'Look at that Face! Would Anyone Vote for That?'

Trump recently came under fire for saying of Fiorina: "Look at that face! Would anyone vote for that?

“Can you imagine that, the face of our next president?! I mean, she's a woman, and I’m not supposed to say bad things, but really, folks, come on. Are we serious?"

He later claimed he was talking about her "persona" and at the debate on Wednesday, he added: "I think she's got a beautiful face and I think she's a beautiful woman" - which also elicited an icy cold response.

Fiorina is gaining ground following her feisty performance in the Regan Library debate on Wednesday night.

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One Michigan poll puts her neck with Trump each with 22 percent support from likely Republican voters.

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