According to a report by the New York Times
This is something similar to what the Wall St Journal reported overnight here. The US has been rather unhappy for quite some time that Chinese officials have been making use of the yuan to boost exports and they certainly won't be happy with the fact that the yuan has fallen by more than 7% against the greenback over the last 3 months.
Even so, it is almost certain that such persuasion will not amount to anything. Sure, China may nod and play along. But as long as the yuan is still trading using a fixing mechanism, they won't have any issues whatsoever.