US President Donald Trump (Photo: Getty)

Trump tweeted: "After two years and millions of pages of documents (and a cost of over $30 million) no collusion!".

His statement came a day after US prosecutors detailed a previously unknown attempt by a Russian to help his 2016 presidential election campaign. The alleged Russian approach was outlined in one of several court filings Friday by US prosecutors in New York and Special Counsel Robert Mueller, who said Trump requested his former lawyer to illegally financed 2 women before the 2016 election.