International Olympic Committee
Mayor Virginia Raggi says the city can't afford to host the huge costs of staging the event.
Patrick Hickey is the head of the European Olympics Committee.
"Russians are not the only sportsmen or women who have been found doping.”
The spike in cost coincides with Brazil's worst recession in years.
WHAT'S HAPPENING
The rules should apply for this year's Summer Olympics in Rio.
The sport that was invented as a joke has come quite a long way.
High levels of viruses linked to human sewage were found in the AP's investigation.
The Chinese capital is the first city ever to host both a summer and winter Olympics.
The collapse of Boston's Olympic effort highlights fundamental problems in the bidding process that could continue to plague cities that want to host.
He says he won't sign a contract that forces taxpayers to cover Olympic cost overruns.