He did nothing...
The Obama administration had a clear idea of Russian election meddling through cyber attacks months in advance of the November 2016 Election Day. The administration’s efforts to stop Russian interference in the 2016 election amounted to warning the Russian government and did not include substantive actions.
The CIA received and presented Obama with reliable intelligence in August 2016 that the Russian government was orchestrating a cyber campaign to tarnish Hillary Clinton under direct orders from President Vladimir Putin, a recent Washington Post
investigation reveals.
However, the first signs of cyber attacks in the 2016 presidential election surfaced about a year earlier, in September 2015. At that time, the FBI
warned the Democratic National Committee (DNC) that DNC computers could be compromised by hackers of yet unknown origin.
https://truepundit.com/fact-check-did-obama-know-about-russian-meddling-and-do-nothing/