The ignorance from this bitch is amazing!
It is not possible for the "White House" aka Trump to "inappropriately" order the DoJ to open any investigation.
We have a Unitary Executive in this country, it is based in Article II of the Constitution which vests
all executive powers in the President, to wit, in Clause 1:
The executive Power shall be vested in a President of the United States of America.
That means there is one man (or possibly one woman at some point in the future) that is elected to be the Executive. Hence all Executive Branch personnel report to (ultimately) and are controlled by the Executive.
If the President orders the DoJ to open, modify, or terminate an investigation, that is the sole prerogative of the President. Full stop.