Oil exec and Trump ally Hamm seeks U.S. probe of oil price crash

WASHINGTON (Reuters) - The founder of Continental Resources Inc , an ally of U.S. President Donald Trump, is pressing the U.S. commodity markets regulator and the exchange to probe whether market manipulation or system failure was behind this week's unprecedented plunge in U.S. crude futures.Continental's executive chairman Harold Hamm sent a letter dated Tuesday, April 21, to the U.S. Commodity Futures Trading Commission asking the regulator to probe whether "potential market manipulation,..