Foreign Secretary Boris Johnson has branded the possibility of Jeremy Corbyn becoming prime minister as "dangerous" and warned against taking a Tory General Election triumph for granted.

Mr Johnson cautioned against complacency regarding a Conservative victory at the polls on June 8, describing the prospect of the Labour leader winning as a real "risk".

During a whistle-stop visit to the Black Country, the MP for Uxbridge and South Ruislip dropped in to the Wolverhampton offices of his former employers the Express & Star where he worked as a reporter in the 1980s.

Speaking to the newspaper, he said: "We should not under any circumstances underestimate the possibility of Labour getting into power under a dangerous Jeremy Corbyn.

"People may well think that the risk of him becoming prime minister is not that great, but they have to understand that the severity of that risk is extreme.

"We cannot discount it and we must be certain that the country is taken forward in the right way under a compassionate Conservative Party."

Former mayor of London, Mr Johnson, was touring the area to support Conservative candidate for West Midlands Metro Mayor, Andy Street, with the pair also heading to Stourbridge.

In the town's High Street he stopped and posed for selfies with members of the public and also handed out Mr Street's campaign leaflets.

Two million voters across the West Midlands are going to the polls on Thursday, to pick the region's first ever directly-elected mayor.

Mr Johnson later tweeted: "Fantastic to meet great people of Stourbridge.

"Strong & stable leadership under Theresa May will secure exciting future for the West Mids."

Earlier, Labour's Tom Watson hit back at Mr Johnson with some colourful language of his own, after the Tory cabinet member branded Mr Corbyn a "mutton-headed old mugwump" who was a threat to national security.

In response, Mr Watson said: "Boris Johnson is a cack-handed, cheese-headed fopdoodle, with a talent for slummocking about, who would do less damage to Britain's reputation in the world if Theresa May sacked him as Foreign Secretary and replaced him with a souvenir paperweight."