The Trump administration is unlikely to move to revise a 1992 act that gives Hong Kong special trade and business privileges unless there is a dramatic escalation by China in response to street protests there, a senior US official said.“It’s going to depend on what the Chinese do,” the official said, adding that the United States might consider sanctions if there was a “precipitating event”, such as Hong Kong police being told the stand down and mainland Chinese forces moving in and using…