So why hasn't this come out publicly? There are apparently some disagreements among officials over unanswered questions, and the Post says Senate Majority Leader Mitch McConnell told the White House he would consider challenging the Russians to be partisan politics. Meanwhile, it also quotes Rep. Adam B. Schiff saying the Obama administration "has all the tools it needs to respond."

Update: In response, the Trump team says "These are the same people that said Saddam Hussein had weapons of mass destruction."

Trump team releases statement on claims of foreign interference in US election: pic.twitter.com/uZQizVoxa6 — ABC News Politics (@ABCPolitics) December 10, 2016

Update 2: The New York Times reports the same thing, noting a reason for the CIA's conclusion: it found evidence of Russian hacking into both parties, however, only information damaging to the DNC was released.