Donald Trump has been accused of “slut-shaming” a female senator by claiming she was once “begging” for donations and “would have done anything” for them.

The US president's comment about Kirsten Gillibrand, the Democratic senator for New York, came after she called on him to resign over sexual assault allegations.

The remark triggered claims of sexism and condemnation from Ms Gillibrand and other prominent politicians, who labeled Mr Trump a “bully”.

It came the day after three women repeated allegations first aired during the election campaign about Mr Trump's sexual conduct towards them.

After the interviews, Ms Gillibrand, who took over Hillary Clinton’s senate seat when she joined the Obama administration, called on Mr Trump to resign.

In familiar fashion, Mr Trump hit back with a tweet, indicating that Ms Gillibrand had asked him to contribute financially to her election campaign.