"I think it's a disgrace that information would be let out. I saw the information, I read the information outside of that meeting," Trump told reporters in his first formal press conference in six months.
Referring to a dossier with allegations that Russia has compromising material on him, the President-elect said, "It's all fake news. It's phony stuff. It didn't happen."
He, however, acknowledged that Russia and some other countries were behind the hacking of Democratic Party computers.
"As far as hacking, I think it was Russia, but I also think we've been hacked by other countries, other people," he said addressing the crowded press conference nine days from his inauguration as the 45th president of the US.
"The DNC was totally open to be hacked. They did a very poor job," he said, adding that attempts to hack the Republican National Committee were unsuccessful and "they were unable to break through."