And some British politicians are calling for the prime minister to fire him because of it.
Coughing fits, fake pink slips and a disintegrating message overshadowed the U.K. prime minister's attempt to rally her party.
Boris Johnson isn't the most diplomatic politician — but now he's the U.K.'s chief diplomat.
The political upheaval may be entertaining from across the pond, but it's also a red flag of the fallout from the vote to leave the European Union.
The formal process of extricating a nation from the European Union might take some time.
In the countrywide referendum, about 52 percent voted to leave, and about 48 percent voted to stay.
The U.K. has voted to leave the European Union in a country-wide referendum.
Voters in the United Kingdom might decide to leave the European Union. How would that work out, exactly?
In an interview with The Telegraph, Boris Johnson said the EU's desire to form a superstate resembles Hitler's vision.
Boris Johnson, the mayor of London, finally made his stance clear: The U.K. needs to leave the European Union.
London Mayor Boris Johnson has joined the campaign to encourage Britain to leave the European Union.