US President George W Bush has said the US is doing all it can for the people of Darfur in western Sudan.
But he has reaffirmed his decision not to commit US troops to the region.
In a BBC interview, Mr Bush said he would continue to raise China's dealings with Sudan in his talks with the leadership in Beijing.
His comments follow the resignation of Steven Spielberg as artistic advisor to the Beijing Olympics.
Mr Spielberg is concerned that China was not using its close economic ties with Sudan to put pressure on the Khartoum government over Darfur.
Mr Bush said he wanted to keep the Olympics and politics separate.
