Here’s what to know about the history of—and the Trump Administration’s efforts to ramp up—“denaturalization.”

A public feud between President Donald Trump and his on-again, off-again ally, billionaire Elon Musk, reignited this week after an apparent truce lasted less than a month.

And Musk seemingly can’t let that go. “Physics sees through all lies perfectly,” Musk posted this week on his social-media platform X. The Tesla and SpaceX CEO’s political power in Washington—which just a few months ago seemed limitless —was always about proximity to the president.