This will be messy, due to Apollo’s ownership stakes in CMG and the TEGNA acquisition. FCC and DOJ might put up more than a few roadblocks requiring a restructure of the deal. Multiple market conflicts.
From what I've seen so far, Apollo will own securities but no actual voting shares in the new TEGNA. I don't know if that will be enough to avoid FCC and DOJ issues, but it seems to be structured similarly to Clear Channel's stake in the former Hispanic Broadcasting Corporation in the late-90's. The FCC and DOJ generally let them operate independently of one another with the exception of not allowing one to acquire the other's DOJ mandated spinoffs.
As we're discussing on the Houston board, the current administration's FCC and DOJ haven't seen anything like this until now. So, we can't completely guess what either will do.