Who gave the ok, how long has the investigation been going on, how long has the CFO been in the sights of the DOJ?
You do have to depend on the people you hired to do their jobs, and expecting the President to micromanage is foolish.
Now the timing is inconvenient, but there's more to this IMHO than just trade between the US and China.
The President should not micromanage; however, he is responsible for conducting foreign policy. This should NOT have been done with at least informing him, and better, consulting with him on it.