Trump's popularity baffles Stephen Hawking

Hawking says Trump is a demagogue who seems to appeal to the lowest common denominator

The Donald Trump phenomena has even Stephen Hawking looking for an explanation.

The British astrophysicist told ITV's morning show Monday that the presumptive Republican Party candidate for U.S. president "is a demagogue who seems to appeal to the lowest common denominator."

Hawking, who understands the workings of the universe, admits he cannot fathom Trump's popularity.

>> Read more trending stories  

Hawking also appealed to British voters to vote to keep the United Kingdom inside the European Union in a June 23 referendum.

He said remaining within the EU provided essential support for British scientific research as well as its economy and security.

He said: "Gone are the days we could stand on our own against the world. We need to be part of a larger group of nations, both for our security and our trade."