Pres Trump has just opened up off-shore drilling.

When George W Bush did this during his first term, gas pump prices dropped. The same thing should happen now, and the reason isn’t so hard to understand.

When Democrats legislate against more drilling, it creates artificial supply-shortages. That drives the price of oil up, which results in higher gas/diesel prices at the pump.

Expanding drilling increases oil supplies, and the price per barrel drops.