Vice President Joe Biden Thursday expressed confidence that China would agree to tough sanctions on Iran.

The measures are intended to curb Iran's ambitions to acquire a nuclear weapon, but China has balked at the international effort to craft sanctions because it fears Iran would cut off its oil supply. 

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"China will agree to sanctions" on Iran, Biden said in an appearance on ABC's "The View" Thursday. "I'm not assuming that sanctions will not work."

Members of Congress from both parties have pressured the Obama administrations to impose "crippling" sanctions against the Middle Eastern nation. 

Over 360 lawmakers sent a letter to President Barack Obama last week asking him to implement the sanctions with or without the support of the United Nations.

At the nuclear security summit in Washington last week, Chinese President Hu Jintao promised to join negotiations for the latest round of sanctions on Iran, but did not say it would back the measures under considerations.

China, one of the world's largest economies, is seen as a key player in enforcing tough sanctions, but has resisted past efforts to court their support.