MarketWatch | Oil logs a gain, but ends lower for January as output, Trump jitters weigh MarketWatch Oil futures on Tuesday booked a modest gain, but finished in the red for the month as traders attempted to sort out the potential impact of President Donald Trump's policies on the industry. Concerns about growing output from U.S. shale-oil producers ... Trump's Border Tax Could Kill U.S Oil Exports, Raise Gas Prices Oil Pares Rise as Supply Gain Concerns Outweigh Weaker Dollar |