Beijing maintains that letting its currency strengthen will not solve the problem of US job losses and has consistently rejected pressure on the issue.
Levin warned that China had until just after the summit to change its currency practices or face action by Congress.
US Treasury Secretary Timothy Geithner also said last week that China's refusal to revalue its currency — which has been effectively pegged at about 6.8 to the dollar for two years — impeded global economic reforms.
However,Adidas, Zhang Tao, a top official at the People's Bank of China, said the yuan was never on the agenda of previous G20 summits, and reiterated that Beijing would adjust its currency policies at its own pace.
Sander Levin,NBA, the powerful chairman of a Congressional committee overseeing taxes and trade, said Wednesday the June 26-27 G20 summit in Toronto was "an important juncture for China to change its inflexible currency practices".
"Seven years of patience from the United States and the international community have run out," he said.
"The (yuan) is China's currency. This is not an issue the international community should discuss," Vice Foreign Minister Cui Tiankai told reporters.
BEIJING (AFP) – China said Friday the value of its yuan currency was not up for debate at an upcoming Group of 20 summit and again rejected outside interference in its foreign exchange policies.
International pressure is mounting on China to revalue the yuan, which Washington says is being kept weak deliberately by Beijing to give exporters an unfair trade advantage that is leading to job losses in the United States.
Zhang and Cui were speaking at a briefing on President Hu Jintao's participation in the summit.