Well this would be a good time to present evidence of said claims which contradicts the evidence we have so far.
"The methods used to carry out the cyberhack are consistent with Russian cyber operations."
-Senator Marco Rubio | Acting chair of the Senate Intelligence Committee
"This was a very significant effort and I think it's the case that now we can say pretty clearly that it was the Russians that engaged in this activity."
Mike Pompeo | US Secretary of State
Russian State-Sponsored Advanced Persistent Threat Actor Compromises U.S. Government Targets - Alert (AA20-296A) Cybersecurity and Infrastructure Security Agency