He has made no secret of the fact he wants to take over every rail service in London -- and today the government appeared to back Boris Johnson's plans.
The Transport Secretary Patrick McCloughlin told London Tonight he had 'no objection in principal', to the Mayor of London having power over rail franchises.
He pledged his support as Mr Johnson officially opened a new route on the London overground service.
Our Political Correspondent Simon Harris has the story.
More top news
The mother of Alice Gross has told an inquest the family have unanswered questions about the circumstances of her death.
Official figures show speed cameras are targeting thousands of drivers in London as they drive to work in the early morning.
There will be a 'zero-tolerance' approach to hate crime the London mayor and Met police chief say.