Chuck Schumer, the senior Democratic senator from New York, has been one of the leading critics of China's economic policies on Capitol Hill - and on Thursday he pounced on the recent Justice Department allegations against China for hacking US companies and unions.
In a letter to Mike Froman, US trade representative, Mr Schumer called on the Obama administration to launch a case against China at the World Trade Organisation on the matter, writes James Politi in Washington.
Mr Schumer said:
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