Story highlights Trump said another culprit aside from Russia could have been behind the US election hack

"It could be somebody else. And I also know things that other people don't know," he said

West Palm Beach, Florida (CNN) President-elect Donald Trump said Saturday he has information that others lack and promised to reveal his knowledge this week, reiterating again his doubts that Russia was behind cyber-meddling in the US election.

Speaking to reporters ahead of an 800-person New Year's Eve bash at his Mar-a-Lago estate, a tuxedoed Trump maintained that another culprit aside from Russia could have been behind the tampering.

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"It could be somebody else. And I also know things that other people don't know, and so they cannot be sure of the situation," he said.

Asked to describe what undisclosed information he knew, Trump said, "You'll find out on Tuesday or Wednesday."

Trump has scheduled an intelligence briefing midweek on the hacking, a response to President Barack Obama's announcement of new sanctions on Moscow in retaliation for the cyber-intrusion.

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