WASHINGTON (Reuters) - President Donald J. Trump nominated Brian Quintenz, a former fund manager, consultant and congressional policy adviser, to serve as commissioner on the Commodity Futures Trading Commission, the White House said in a statement on Friday. Quintenz, who founded and was managing principal at Saeculum Capital Management LLC for three years ending in 2016, was nominated to serve the remainder of a five-year term ending on April 13, 2020, the statement said. 