Renowned astrophysicist Stephen Hawking can school us on anything related to black holes.

He has written about the secrets of the universe, stars, time and space, among many others.

But there is one thing he admits he cannot understand or explain: the rise of presumptive Republican candidate Donald Trump.

Just recently, Hawking was asked by ITV's Good Morning Britain to explain the popular appeal of the billionaire tycoon.

"I can't," says Hawking. "He's a demagogue who seems to appeal to the lowest common denominator."

That isn't the only thing Hawking talked about during the interview, however. He also ventured into politics, urging British voters to support the remain campaign in the European Union referendum.

He says it's not just for the sake of the economy and security, but for the sake of science as well. In March, Hawking described the notion of Brexit as a "disaster" for science.

"Gone are the days when we could stand on our own, against the world," Hawking said during the interview.

He believes that Britain should be part of a bigger group of nations for security and trade.

What's more, just the mere possibility of leaving the EU has already resulted in a fall in the pound, he says. Markets judge that it will ruin Britain's economy.

Additionally, Hawking talked about one of the major concerns of many: immigration.

Hawking says there are two clear reasons why we should stay in. One, that it promotes the mobility of people. He says students from the EU can come to Britain to study, or vice versa.

He says it is important that at the current level of research, the exchange of students allows skills to transfer and spread more quickly. It will bring new people with a diverse range of ideas, all from different backgrounds.

The second reason is financial, he says. Being in the EU will be beneficial as the European Research Council gives large grants to institutions in the United Kingdom. The goal is to foster and promote exchanges.

Hawking was once a physics professor at University of Cambridge. He was diagnosed with motor neurone disease in 1963 and was given only two years to live.

Hawking went on to write the book "A Brief History of Time." He is a bestselling author and one of the most instantly recognized scientists.

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