This article pretty much sums up what's going on with this and Trumps response.

https://www.theguardian.com/us-news/2016/dec/11/intelligence-agencies-cia-donald-trump-russia?

The best line in the story is this:

"“There is not just smoke here. There is a blazing 10-alarm fire, the sirens are wailing, the Russians provided the lighter fluid, and Trump is standing half-burnt and holding a match,” 


“If Trump is willing to disregard sound intelligence now, and demean the hard-working and patriotic Americans who produced it, I fear what he will do as president when confronted with unpleasant truths,” 

Clearly a frightening prospect when you have a president elect who is that vain