A handful of big one-day losses during July pushed the oil market to its biggest monthly decline in two years — and the source of those big swings can often be traced back to the White House. Supply and demand for oil are roughly in balance, so traders have been sensitive to any headlines that could tip the market into oversupply or shortage. Lately, there has been no shortage of news, in part because of President Donald Trump ‘s penchant for unexpected comments on Twitter, as well as his administration’s effort to impose sanctions on Iran, the world’s fifth-biggest oil producer. “Welcome to a headline-driven market,” said John Kilduff, founding partner at energy hedge fund Again Capital. “It’s duck and cover and keep an eye on your Twitter feed.” U.S. […]