Personally I think Trump is the most appalling president the USA has chosen in a long time. However on this point he is on solid ground. The accusations that the Russians influenced the US election is pure politics, played by the Obama administration.

We may take it as a given that there's cyber intrusions into the networks of political parties in every country of interest. The IT infrastructures of political parties are likely to be much easier to penetrate than government networks. But at the same time a great deal of valuable information can be obtained. In all likelihood those intrusions come from both foreign and domestic sources.

Now to the point: the public report issued by the FBI and Homeland security identified two breaches of the Democrats IT network. The report does not say what, if anything, was obtained in those breaches. The FBI and HS do not say that the election was influenced by that breach. That claim is made by the Obama administration, only.