Fox News host Steve Doocy had compared the crowds celebrating Philadelphia's Super Bowl victory to the number of people who took to the streets of London "to demand the government come up with more money for Britain's overburdened national health service - the same system Democrats have continued to push for here in the United States."

They then called on Nigel Farage to explain why people were taking to the streets.

"Well the big problem we've got is a population crisis caused by government policy on immigration," Farage said.

"We have a population of 65 million but it's increasing by half a million people a year. We just haven't got enough hospitals, we haven't got enough doctors, we haven't got enough facilities."