That’s how Trump senior adviser Kellyanne Conway is described in an upcoming tell-all book by former White House staffer Cliff Sims.

“Team of Vipers: My 500 Extraordinary Days in the Trump White House,” is set to be released on Jan. 29, but Vanity Fair published a sneak-peek excerpt Wednesday, much of it focused on Sims’ interactions with Conway, who has become best known for her tenacious and resolute defense of Trump to the news media.

“Early on she was content — very content — to sit back, go on TV, and let rivals eat one another alive,” Sims wrote. “Her agenda . . . became more and more transparent. Once you figured that out, everything about her seemed so calculated.”

“She seemed to be peren­nially cloaked in an invisible fur coat, casting an all-­knowing smile, as if she’d collected 98 Dalmatians with only 3 more to go.”

Sims also wrote that Conway bad-mouthed Trump‘s top advisers to the press. On one occasion, he said he was drafted to Conway’s office to write a response to claims by MSNBC that she trash-talked Trump in private, and he inadvertently was able to see a number of instant messages between Conway and journalists.

“Over the course of 20 minutes or so, she was having simultaneous conversations with no fewer than a half­-dozen reporters, most of them from outlets the White House frequently trashed for publishing ‘fake news,’” he wrote. “Jour­nalists from The New York Times, The Washington Post, CNN, Politico, and Bloomberg were all popping up on the screen. And these weren’t policy conversations, or attempts to fend off attacks on the president. As I sat there trying to type, she bashed Jared Kushner, Reince Priebus, Steve Bannon, and Sean Spicer, all by name.”

Conway denied the account, saying in a statement: “While it’s rare, I prefer to knife people from the front, so they see it coming,” Vanity Fair said.

While Sims was not well known outside the White House, his book is getting some early praise for his observations of how working within the chaotic Trump administration disillusioned a young conservative.

“Some of us will be proud of what we did,” he wrote. “Others will be ashamed and never speak of it again. Some will remember this as the best work we ever did. Others will wish it could all be deleted from the record.”