Michelle Obama said she has been shaken to the core by comments that Republican nominee Donald Trump made in which he is heard on a 2005 tape bragging about assaulting women because he is famous.

Speaking at a campaign rally in New Hampshire for Democratic nominee Hillary Clinton, Mrs Obama called the comments "shocking and demeaning".

She also dismissed the suggestion that they were simply "locker room talk", saying they were an affront to all women, parents and every citizen in the United States.

"I can't stop thinking about this. It has shaken to me to my core in a way that I couldn't have predicted," the first lady said.

"So while I would love nothing more than to pretend that this isn't happening and come out here and do my normal campaign speech, it would be dishonest and disingenuous to just move on to the next thing like this was all a bad dream. This is not something we can ignore."

Mrs Obama said the comments made by Mr Trump are part of a long history of demeaning women.

"We have a candidate for president of the United States who over the course of his lifetime, over the course of this campaign, has said things about women that are shocking, so demeaning," she said.

"I simply will not repeat anything here today.

"Last week, we actually saw this candidate bragging about sexually assaulting women.

"I can't believe I'm saying that, a candidate for president of the United States bragged about sexually assaulting women."

Mrs Obama went on to say that this was not something that should be dismissed, adding that women were hearing these comments and recollecting painful memories of when they were harassed in their offices or sexually assaulted.

Mr Trump has lost support in New Hampshire following the release of the video in which he is heard bragging about how his fame allowed him to "do anything" to women.