U.S. President Donald Trump has warned OPEC not to tighten the oil market too much and risk another spike in prices that could harm the global economy – and his re-election campaign in 2020. “Oil prices getting too high,” the president warned in a message posted on Twitter on Monday. “OPEC please relax and take it easy. World cannot take a price hike – fragile!” The president has kept up a regular commentary on oil prices over the last year and has pressed Saudi Arabia, de facto leader of the Organization of the Petroleum Exporting Countries, to push them lower. Earlier interventions were triggered when prices climbed into […]