"There has been no evidence of a foreign power altering the outcome or vote tabulation in any United States election," Trump said. He's right about that.
"In a statement the Democratic National Committee said Trump's order 'does nothing to hold Russia accountable' for 2016." (Source) Read the first sentence above again.
Look, there has been no evidence of Russia, the nation, doing anything illegal concerning the United States 2016 election. There have been highly questionable accusations but no definitive evidence.
What we do know is that the Democratic National Committee rigged the Democratic primary against the Bernie Sanders candidacy. No Trump order does anything to hold the DNC accountable for that. Even Bernie Sanders looked the other way.