President Barack Obama has ordered a "full review" of hacking-relating activity aimed at disrupting last month's presidential election and he expects that report before he leaves office on Jan. 20, a top White House official said Friday.

"We may be crossed into a new threshold and it is incumbent upon us to take stock of that, to review, to conduct some after-action, to understand what this means, what has happened and to impart those lessons learned," Obama counterterrorism and homeland security adviser Lisa Monaco told reporters at a breakfast arranged by the Christian Science Monitor.

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U.S. intelligence officials have blamed the Russian government for pre-election hacking of Democratic officials and political committees. Several Democratic senators have asked Obama to declassify more details about the attacks and why the U.S. concluded the Russians were behind them.

Monaco would not commit to making the findings of the review public, but did say that it would be shared with "a range of stakeholders," including members of Congress.