U.S. Vice President said Thursday he felt 'almost obliged to apologize' to the Mexican people for some of Trump's rhetoric about the country

for using the F-bomb, after he said he was 'not going to pay for that f***ing wall!'

The former president of Mexico has likened Donald Trump to Hitler, saying his desire to return to the 'old days of conflict and war' reminds him of the German dictator.

Speaking to CNN's Anderson Cooper, Vicente Fox said the presidential hopeful has 'offended Mexico, Mexicans, (and) immigrants.

'He has offended the Pope. He has offended the Chinese. He's offended everybody.'

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Speaking to CNN's Anderson Cooper, Vincente Fox (top left) said: '[Trump] is like Hitler in the beginning. He's going to use his executive power to do what he likes without considering that he has a congress there'

Former President of Mexico Vincente Fox said that Republican frontrunner Donald Trump reminded him of German dictator Adolf Hitler (pictured)

Pope Francis had declared last week that anyone who embraced the billionaire's border-security positions 'is not Christian.'

The former Mexican president's remarks come a day after his scathing response to Trump's plan to make Mexico pay for a wall between the Mexico-U.S. border: 'I declare that I'm not going to pay for that f***ing wall!'

Trump has since called on Fox to apologize for his 'filthy, disgusting' language - but Fox once again refused.

Fox retorted that Vice President Joe Biden told him it was 'a sin' that we 'have guys like [Trump] speaking the language he speaks.'

Speaking in Mexico Thursday, Biden had said he felt 'almost obliged to apologize' to the Mexican people for some of Trump's rhetoric about the country.

Addressing Mexican President Enrique Peña Nieto he added: 'I just want you to know Mr President, that the most heated rhetoric that you have heard from some of the competitors for nomination for President is not who are as the American people.

'It is not a view, that is the view of the majority of the American people. It's the exact opposite view.'

Harvard Professor Danielle Allen, a liberal political theorist at Harvard University said: 'Like any number of us raised in the late 20th century, I've spent my life perplexed about exactly how Hitler could have come to power in Germany. Watching Donald J. Trump's rise, I now understand'. Pictured: Hitler addressing a meeting, 1935

Anne Frank's step-sister, Eva Schloss told Newsweek that Trump is 'acting like another Hitler by inciting racism'. Pictured: Trump fans at a rally in Texas

Cooper also challenged Fox about Trump's claims that the Mexican government was 'helping illegal Mexican immigrants to enter America'.

Fox said this was an 'absolute lie' and added: 'There are more Mexicans coming back then Mexicans going into the United States

'Mexican economy has been improving and they see lots of opportunities here now.'

Fox explained: 'He's like Hitler in the beginning. He's going to use his executive power to do what he likes without considering that he has a congress there.

'Republicans and Democrats, that he has a judiciary, governors, he has a very strong citizenship.

'That is a democracy that should be the example for the rest of the world.

'So he is behaving very, very, very poorly.'

Fox is not the first to make this damning comparison.

TWITTER-BURN: Trump said if he had cursed his way through an interview about his proposed border barrier, he would have been pilloried for it

Harvard Professor Danielle Allen, a liberal political theorist at Harvard University wrote in The Washington Post: 'Like any number of us raised in the late 20th century, I've spent my life perplexed about exactly how Hitler could have come to power in Germany.

'Watching Donald J. Trump's rise, I now understand.'

And renowned political scientist Noam Chomsky explained that Trump's rise to power has been facilitated through 'fear, along with the breakdown of society'.

In an interview on Alternet, Chomsky explained: 'People feel isolated, helpless, victim of powerful forces that they do not understand and cannot influence.'