The spectre of China as banker for the US and the prospect of Beijing dumping its vast holdings of US government debt is thought to keep some US congressmen awake at night.
They are unlikely to be convinced by yesterday's comments from Yi Gang, the man in charge of China's foreign exchange reserves, that Beijing does not wish to politicise its holdings of US Treasuries.
There was muted reaction in Washington where the Treasury department would not immediately comment.
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