Unless you catch "hackers" in the act, it is very hard to determine who was doing the hacking. Why wasn't this brought up before election?
"Why wasn't this brought up before the election"? Poor Donald. Poor us. Here is an article from October 7 where the Office of the Director of National Intelligence and the Department of Homeland Security said the Russians were interfering with our election by hacking, which was BEFORE the election.
You see, Trump just doesn't give a fuck. He ignores his daily intelligence briefings and thinks he has all the answers. He is a total embarrassment. And a dangerous one at that.