Oil prices edged up on Tuesday, bolstered by a weaker dollar, while markets watched President Donald Trump’s threats of higher US tariffs on European nations over his desire to buy Greenland. Brent futures rose 15 cents, or 0.2%, to $64.09 a barrel at 0430 GMT.The US West Texas Intermediate crude contract for February, which expires on Tuesday, was up 14 cents, or 0.2%, to $59.58. The more a