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President Barack Obama has ordered an investigation into a series of cyber-attacks, blamed on Russia, that shook the US election season.
The hacks targeted emails at the Democratic Party and a key aide to presidential nominee Hillary Clinton.
In October, US government officials pointed the finger at Russia, accusing it of meddling in the US vote.
Republican Donald Trump, who will succeed Mr Obama in the White House, has consistently disputed that.
This week he told Time Magazine: "I don't believe it. I don't believe they [Russians] interfered."
He added that he thought the accusation against Russia was politically driven.
Democrats were enraged when hackers breached email accounts of the Democratic National Committee and Mrs Clinton's campaign chairman, John Podesta.
State voter registration databases in Illinois and Arizona were also breached.
The Podesta emails were revealed by Wikileaks and posted online.
At one point, Mr Trump encouraged Russia by name to "find" Mrs Clinton's emails, although he said after an outcry that he was being sarcastic.
Democrats claimed the hacks were a deliberate attempt to undermine Mrs Clinton's campaign.
"The president wanted this done under his watch because he takes it very seriously," said White House spokesman Eric Schultz.
"We are committed to ensuring the integrity of our elections."
He described the review as a "deep dive" into "malicious" cyber-activity.
It will look at the methods, targets and the US government's response, he said, and it will be completed before Mr Obama leaves office and hands over to Mr Trump in January.
It is unclear if the contents of the review will be made public.
More on Trump and Russia
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The hacks targeted emails at the Democratic Party and a key aide to presidential nominee Hillary Clinton.
In October, US government officials pointed the finger at Russia, accusing it of meddling in the US vote.
Republican Donald Trump, who will succeed Mr Obama in the White House, has consistently disputed that.
This week he told Time Magazine: "I don't believe it. I don't believe they [Russians] interfered."
He added that he thought the accusation against Russia was politically driven.
Democrats were enraged when hackers breached email accounts of the Democratic National Committee and Mrs Clinton's campaign chairman, John Podesta.
State voter registration databases in Illinois and Arizona were also breached.
The Podesta emails were revealed by Wikileaks and posted online.
At one point, Mr Trump encouraged Russia by name to "find" Mrs Clinton's emails, although he said after an outcry that he was being sarcastic.
Democrats claimed the hacks were a deliberate attempt to undermine Mrs Clinton's campaign.
"The president wanted this done under his watch because he takes it very seriously," said White House spokesman Eric Schultz.
"We are committed to ensuring the integrity of our elections."
He described the review as a "deep dive" into "malicious" cyber-activity.
It will look at the methods, targets and the US government's response, he said, and it will be completed before Mr Obama leaves office and hands over to Mr Trump in January.
It is unclear if the contents of the review will be made public.
More on Trump and Russia
Jump media player
Media player help
Out of media player. Press enter to return or tab to continue.
Media captionCIA director John Brennan tells the BBC what global threats Donald Trump will face as US president Why Trump strikes a chord with Russians
Russia's Putin calls Trump 'a clever man'
Are there any Trump links to Putin?
Related Topics