Trump threatens DOJ probe of oil companies

Driving the news: "The big Oil Companies are not dropping their price at the pump commensurate with the sharply lower prices they are paying for Oil," he claimed in the post.

• "I have instructed the DOJ to immediately start looking into this. Gasoline prices better start going down a lot faster than what I'm seeing!"

My thought bubble: This is a classic political move when gasoline prices are high. Regulators in the Clinton, Bush, Obama and Biden years all conducted various types of inquiries.

Reality check: Probes going back decades have failed to turn up anti-competitive behavior in retail fuel markets outside of isolated local examples.

How it works: In the short term, even when oil prices fall, gas stations are working through the higher-cost inventory they bought when prices were higher.

• It's one of the reasons market-watchers point out the "rockets and feathers" dynamic. Retail fuel costs shoot up when oil prices do, but can decline slowly even when crude falls sharply.
• The national average regular gasoline price is $3.93 per gallon on Wednesday, per AAA. It reached $4.56 in May, compared to just under $3 before the war began in late February.