He's picked fights with the Pope, Cher, Megyn Kelly, and pretty much anyone who dares utter a bad word about him.

But there's one person Donald Trump has never had an argument with: His wife.

Melania Trump has claimed she and her husband have never had a tiff during their 20-year relationship.

Loved-up: Melania Trump has claimed she and Donald have never had a tiff during their 20-year relationship

Melania, who could be First Lady this time next year, said she often tells her husband what she thinks of his policy ideas - even if she does not like them

In a revealing interview on Fox News' On The Record, Melania said she and Donald have never had a full-blown row.

'We don't have fights. We disagree but that's OK. I have my own brains and he has his own brains,' she said.

Melania, who could be First Lady this time next year, said she often tells her husband what she thinks of his policy ideas - even if she does not like them.

'When I don't agree with him, I tell him,' she said.

'Sometimes he listens, sometimes he doesn't. He makes his own choices. He's big enough, he's an adult. He knows the consequences. He is listening.

'I tell him my way and he accepts that. I tell him what I think and he is the same. He thinks what he thinks.

'We talk a lot. I'm not a yes person. I'm yes or no. If I don't agree with something, I tell him.'

The former model told Fox's Greta Van Susteren that Trump can get angry over 'stupidity', but that they have never fought.

The former model told Fox's Greta Van Susteren that Trump can get angry over 'stupidity', but that they have never fought

Despite her ambitions to be First Lady, Melania has not ruled out continuing with her own business endeavors

Perhaps the reason the couple have never fallen out is because of Melania's 'thick skin'.

She said she can weather criticism of her or her husband in the media because she grew used to being in the limelight from her time as a fashion icon.

'I have a thick skin. I see a lot of lies,' she said. 'Only I have my story and I know the truth. I have a thick skin and know (criticism) will be part of the campaign.

'I knew what would come with the territory, when he decided that he would run I knew that would be the case, that people would write untrue stuff and not check the facts.

'I am very strong and it doesn't bother me.'

Melania puts her compatibility with Donald down to their independence, saying that she carefully divides her time between campaigning and raising her son, with family always the priority.

Before Trump announced his run for president last June, he would get up early in the morning and go to work and not see each other again until dinner at around 7pm.

Melania puts her compatibility with Donald down to their independence, saying that she carefully divides her time between campaigning and raising her son

But all that has changed now, Melania says.

'It is 24/7. He's on the road all the time. He's travelling, sometimes two or three speeches a day.

'He doesn't sleep much, he's very excited about it. He knows what he can do for America. He knows what America can be.

'I try to stay as normal as possible but it has changed. I don't see him as much but I travel with him when I can.

'He travels a lot and I sometimes go with him on the campaign trail. I went to Iowa and New Hampshire. It's a busy schedule but I'm handling it. It's a balance.

'It's something new. Iowa was beautiful and very different. It was something really special and you see a different part of the country. It's a great experience.'

Despite previously remaining coy on the prospect of being First Lady, Melania revealed that she has already started making plans for the future.

'I'm a perfectionist, I like to do things perfect and I like to go 100 per cent into what I do,' she said.

'If the American people would select my husband to be president I would support him and I would support the United States.'

Melania, who said she has never been inside the White House, added: 'I will work with women and children, who are our future, we need to guide them. Children need us.

'I will pick one or two charities near to my heart and back them 100 per cent. 'Make a Wish Foundation, Boys Club of New York, American Red Cross. Make a Wish is the top.'

Despite her ambitions to be First Lady, Melania has not ruled out continuing with her own business endeavors.

'I have my ideas so maybe I will continue (with business) when life has calmed down and is less busy,' she said.

'Everything is in the air for now but when the time comes we will see. We are just enjoying life, I want to spend time with family and my husband and my child and just enjoy.'

Melania also spoke about Hillary Clinton, who attended her and Donald's wedding in Florida in 2005

Despite previously remaining coy on the prospect of being First Lady, Melania revealed that she has already started making plans for the future

Melania also spoke about the first time she and Donald met. He invited her to a party in New York in September 1996 - when he was married to Marla Maples - but brought along a date of her own.

She did not give her his phone number, she said, but she asked for his.

'I liked him. He had a great charm but he arrived with a date. And he was very charming and had a great mind, great energy. We had a connection from the beginning,' she gushed.

Melania did not immediately know during their first date - at a bar in downtown Manhattan - that they would get married, but said there was 'great chemistry'.

As well as repeatedly praising her husband, Melania slipped in the odd political comment backing Donald.

She made a thinly-veiled swipe at the Republican establishment's failure to rally behind Trump despite his success in the campaign so far.

'If the people support him from the party he will have an even easier time,' she said.

'He understands how everything works and is a great deal breaker and is a great negotiator and has a great heart.'

She also spoke about Hillary Clinton, who attended her and Donald's wedding in Florida in 2005.

'It was a different time,' Melania said. 'That was 2005. [Donald] was not running for the office. He was friends and got along with many many people so I don't see anything wrong with that.'