WASHINGTON - President Donald Trump acknowledged on Friday that Russia launched an anti-US campaign ahead of the 2016 election, but in a message on Twitter sent after Special Counsel Robert Mueller charged more than a dozen Russians with meddling in the election, Trump said his campaign did nothing wrong."Russia started their anti-US campaign in 2014, long before I announced that I would run for President. The results of the election were not impacted. The Trump campaign did nothing wrong - no collusion!" Trump said in a tweet.