Here's a funny thing about the Justice Department's Antitrust Division these days.

When a merger involves an entity the president openly despises—cough, CNN—antitrust enforcers are all about super-aggressive enforcement, bringing (and losing) the first challenge to a vertical merger since the Carter administration.

Or take Google and Facebook—which President Trump has blasted for their alleged anti-conservative bias—as well as Amazon, which is owned by Trump nemesis Jeff Bezos. Last week, Antitrust Division head Makan Delrahim announced a wide-ranging review of “market-leading online platforms” that's virtually certain to put the trio on the hot seat as calls mount for their breakups.