Meanwhile, police in San Francisco are preparing for possible disruptions when the Olympic torch stops in the city today. San Francisco is the only North American stop of the Olympic torch relay. On Monday, three pro-Tibet activists climbed the cables of San Francisco’s Golden Gate Bridge and unfurled a banner reading “One World, One Dream: Free Tibet.” Tibet is also becoming an issue in the US presidential race. On Monday, Senator Hillary Clinton called on President Bush to boycott the Olympics opening ceremony in Beijing.