Oil futures edged lower after making big gains yesterday on the U.S.’s tightening of the blockade of tankers entering or leaving Venezuela.

The pursuit of the tanker, off the coast of Venezuela, is the second such operation this weekend and the third in less than a week.

The fleet of ghost ships Venezuela uses to smuggle part of its oil to black markets, which President Donald Trump vowed this week to stop with a military blockade, is made up of dozens of old tankers and operates following the example of other nations under sanctions such as Russia and Iran,

Is it oil, drugs, immigrants or politics? President Trump's explanations of his animosity for Venezuela are hard to keep straight.