Donald Trump hardly needs anyone else to serve as his mouthpiece.

The most clamorous president in modern history always gets his message out — in a daily riot of online posts, interviews and rancor with reporters.

The departure of a press secretary therefore might seem like a trifle to the messenger in chief. But the exit of Karoline Leavitt, announced Wednesday, represents a significant personal and political loss. The vacuum she’ll leave will emphasize her role as a vital member of the president’s brain trust.

But she is far more than a spokesperson. Leavitt understands the Trump id. She’s been a leader in his second-term assault on Washington institutions of accountability — in this case, the Beltway press. Just like the boss, she broke the mold of her position. And with relentless trolling of reporters, she’s exposed the fractures of traditional journalism in the social media age.

Leavitt said on social media on Wednesday that since the birth of her second child, a daughter, on May 1, she’d realized she couldn’t be the mom her kids deserve while devoting the “constant time, energy, and attention,” her job requires. Trump, perhaps softening the blow to himself of the departure of a 28-year-old he praised as one of his “most trusted aides” announced that Leavitt will continue to serve as an outside adviser.