I can understand why you may not know what ministry is involved - recent name change.
The ministry in charge of the INVESTMENT CANADA ACT was previously Industry Canada. It has changed to Innovation, Science and Economic Development Canada.
Sadly, they will not care about any take over of PTK. It is currently ~$725,000,000 under the threshold for a review.
PMJT is also not going to care, but he may give us a shoulder to cry on.