Emily Thornberry let rip on the US President who she labelled a "sexual predator" in a passionate speech at the Labour leadership hustings.
The shadow foreign secretary called for more women in leadership positions around the world to be able to stand up to Donald Trump and other "big men".
She called for "no backsliding" on women's rights at home and abroad as she answered a question on Trump's attempts to undermine the right to abortion in the US.
She stormed: "When it comes to making sure women's rights are appreciated across the world I fear with the growth of big men and people like Donald Trump who think that it's ok to sexually assault women and still be president of the United States, we need to have more women leaders on the international stage who say 'you are a sexual predator, we say 'no' to you, this is not the way to behave.
Vigorously pointing her finger she shouted: "The women of the world say no, we say 'no, we will not be humiliated like this.
"We are powerful and we fight back."
At the hustings event in Bristol fellow candidate Lisa Nandy spoke of the abuse women receive in politics.
She said that when she first became an MP she told young women in her constituency "I want to see you as the politicians of the future" but explained that "ten years later I hesitate before I say that because I'm not sure that I want to subject them to what women like me and Becky and Emily have to put up with in politics."
She called for Labour men and women to "speak up" about the importance of women leaders calling for them to "walk the walk as well as talk the talk".
While Rebecca Long-Bailey warned the UK faces a government that is "just as bad as Donald Trump's and we are going to have to fight Boris Johnson every step of the way."
She also spoke of the need for greater trans rights and for opposition to cuts that disproportionately affect women.
Keir Starmer, acknowledging his status as the only man left in the contest, he said: "Let me make this clear and make it a pledge - I will be no less a champion of women's rights than the other candidates on this panel."
He added: "That's what I've done all my life" pointing to his professional record.
During the hour and a half long debate the four candidates found common ground on the need to invest in social care, housing, education and the need to tackle climate change.
But when it came to reforming the Labour Party some of the divisions were exposed.
Lisa Nandy and Rebecca Long-Bailey clashed over changing how MPs are selected.
Shadow business secretary Ms Long-Bailey told supporters at a hustings in Bristol that she would bring in open selections if she was elected leader to cheers from the audience.
The move would make it easier for local party branches to deselect sitting MPs before elections.
"Being an MP is not a job for life," said Ms Thornberry who said that poor MPs should be deselected by their members.
But Wigan MP Ms Nandy told the audience she disagreed with her rival's views.
"The MPs I want to get rid of are Tories, not Labour," the former shadow energy secretary said.
While Keir Starmer did not talk about a change in the rules but focused instead of changing the "culture".
He called for Labour to start the process to select new candidates as quickly as possible so that they are "open and transparent and there's no imposition from the NEC" - as happened before the general election.
