What if Putin told him that he didn't do it. You can't expect Trump to trust US intelligence experts over a former KGB officer, can you?
LOL.
That was literally his defense of Russia collusion in the US election in 2016. As an aside, I still think 'Russia Collusion' is a very horrible headline/name when the most that was done was ad buys and efforts to make already divided Americans more divided. Makes it sound much worse then it was, even if it was very horrible.
But like shit, if you have top intelligence people saying that Russia did this -- from many different parts of the US government -- then what is there to talk about? May China have been involved too, yes, but that's not something that they're saying right now.
If the intelligence community is looking for some sort of way to get public support behind some sort of war with Russia, then I understand the concerns of Trump, but that's not what he's pushing here. If he really wants to 'get to the bottom of this' you setup some sort of bipartisan committee in Congress to see what they can find on the matter if you don't want to trust shadowy figures, but yet again, not what is happening here.