On the domestic front, Mr Javid is an unashamed believer in tax cuts, which he suggests would be a hallmark of his Premiership. "I'm a low tax person," he says. "I think it [cutting taxes] can pay for itself, it leads to more dynamism in business".

He highlights the fact that tax revenues increased after George Osborne's decision to cut the 50p rate of income tax to 45p. "I was in the Treasury at that time, I argued we should go as far as necessary to raise more taxes," Mr Javid says.

"What that demonstrated, at least that cut to 45p, was that we’re getting more from the highest earners in this country."

The Home Secretary indicated that like Dominic Raab, his rival for the Tory leadership, he wants to cut the basic rate of income tax. However he also suggested that the additional rate of 45p could be scrapped entirely under his Premiership.

"If it can be demonstrated that a further cut in the additional rate can raise more taxable revenues that should be looked at," he says. "If I was Prime Minister, my intent would be to do as much as I can to keep cutting taxes on personal income."

He also wants to see more investment in Britain’s infrastructure. The Home Secretary is proposing a £100billion investment fund that takes advantage of low interest rates to renew Britain’s roads, railways and broadband.

“The key is this,” he says. “Every single project that has to generate a higher return for the Exchequer than the borrowing rate.

He wants to build a national fibre broadband network. At present, just 5 per cent of UK properties have full-fibre connections capable of delivering super-fast broadband compared to nations like Japan, South Korea and Singapore where the figure is 100 per cent.

After years of austerity, Mr Javid believes it is time to "show our love" to public sector workers. In contrast to many of his rivals, the Home Secretary says that his success has been dependent on public services.

"I look back at my own upbringing and I think of the primary school I went to, my comprehensive school, the further education college I went to, the library I used to go and study in because there was no place to study in a two bedroom flat with seven people living in it," he says.

"Sometimes I think some people think of education, health or welfare as just the names of departments to be managed. But for me, these were my lifelines."

Mr Javid, whose brother is a senior police officer, highlights the work he has done in repairing relations with the police since becoming Home Secretary.

"Our relationship with the police was seriously damaged," he said. "It's taken a whole year to repair that. Yes, they have got more money. But that's not the reason. The reason is because I've been listening.

"I've been spending the time. And I think as Prime Minister we can do more to reset our relationship with the public sector. And show that we embrace these workers, we love what they do, because we all rely on them."

Ahead of Mr Trump’s visit this week, Mr Javid makes clear that Huawei - the Chinese company - should not be involved in helping build the nation’s 5G network.

He was one of five Cabinet ministers who objected to the involvement of Huawei in “non-core” parts of the 5G network at a meeting of the National Security Council

“I think we need to take into account seriously the concerns of our allies about certain providers of 5G infrastructure,” he says.

“I’m pleased we haven’t made a final decision yet, because there’s still some discussions to be had on this. And we do need to take into account very carefully what others are thinking, because these are top security partners, and they're there for the long term. And we need to make sure that we are we're in a position to wake and continue to work with them.”

Mr Javid says that his career before entering Parliament, and his Cabinet experience, has equipped him to run the country. Before becoming MP for Bromsgrove in 2010, he earned a reported £3million a year with Deutsche Bank.

"Before I came into politics in 2010, I spent 19 years in business and finance," he said. "I started with the bottom of that industry, made it to the heights of that industry, and worked not just in the UK but around the world. I have closed many deals, billion dollar deals and things I got things done.

"And since I've been in Parliament since 2010. I've worked in five Government departments starting in your Treasury, and I've run four of them. So I believe that I've got the experience the ideas to get things done and deliver.”

Not everyone in Mr Javid’s family is quite as enthusiastic about the prospect of him becoming Prime Minister, with one of his daughters harbouring some significant reservations.

“One of them certainly has said she doesn't want to move to Downing Street because her journey to school will be twice as long,” he said.

Earlier this week his colleague and rival for the Tory leadership, Rory Stewart, admitted to smoking opium while in Afghanistan.

Despite growing up in an area where some of his schoolmates became drug dealers, his own vices are relatively mild.

Asked what is the naughtiest thing he has ever done, he replies: “I grew up as a young kid in some pretty challenging areas. Let’s see. Smoking cigarettes as a kid behind the bicycle sheds? Not quite smoking opium.”