A spokesman for Ken Livingstone said: "Boris Johnson lost his temper because he lost the debate - he talked about cable cars, not cutting fares and the squeeze on Londoners."
More top news
The US first lady travelled without her husband to support the Invictus Games, which were founded by the Prince in 2014.
The Pentagon sent a group of military planes just off the state's coast in a show of force.
Iran says it has successfully tested a new medium-range missile, bringing condemnation from Foreign Secretary Boris Johnson..