President Barack Obama has ordered intelligence officials to conduct a broad review on the election-season hacking that rattled the presidential campaign and raised new concerns about foreign meddling in US elections, a White House official said on Friday.

Lisa Monaco, the White House counterterrorism and Homeland Security adviser, said Mr Obama ordered officials to report on the hacking of Democratic officials' email accounts and Russia's involvement.

The report is due to be submitted to the president before he leaves office next month. Ms Monaco did not say if the report would be made public.