Trump warned against being quick to pin the blame on Russia for the hacking of U.S. emails. The Washington Post also reported on Friday that Moscow could be behind intrusion into a laptop owned by a Vermont electric utility.
U.S. intelligence officials have said that they are confident Russia was behind the hacks of political figures, which could have played a role in Trump's defeat over Democratic presidential candidate Hillary Clinton.
"I think it's unfair if we don't know. It could be somebody else. I also know things that other people don't know so we cannot be sure," Trump said.
Asked what that information included, the Republican President-elect said, "You will find out on Tuesday or Wednesday."