President Donald Trump tweeted an endorsement on Sunday, Nov. 10, of an upcoming book by former United Nations Ambassador Nikki Haley in which she laid out details on how two White House official tried to undermine the president.

“@NikkiHaley is out with a new book, “With All Due Respect” this week,” President Trump wrote. “Make sure you order your copy today, or stop by one of her book tour stops to get a copy and say hello. Good luck Nikki!”

In “With All Due Respect,” that comes out Tuesday, Haley said then-Secretary of State Rex Tillerson and then-White House chief of staff John Kelly embarked on a coordinated effort to resist the president and asked her to join them during a closed-door meeting.

“Kelly and Tillerson confided in me that when they resisted the president, they weren’t being insubordinate, they were trying to save the country,” Haley wrote. “It was their decisions, not the president’s, that were in the best interests of America, they said. The president didn’t know what he was doing. … Tillerson went on to tell me the reason he resisted the president’s decisions was because, if he didn’t, people would die.”

Haley said she was offended that two White House officials would try to undermine the president.

“Instead of saying that to me, they should’ve been saying that to the president, not asking me to join them on their sidebar plan,” Haley wrote. “It should’ve been, ‘Go tell the president what your differences are, and quit if you don’t like what he’s doing.’ But to undermine a president is really a very dangerous thing. And it goes against the Constitution, and it goes against what the American people want. And it was offensive.”

President Trump fired Tillerson in Marche 2018, calling him “dumb as a rock.” Kelly’s departure was in December 2018.

“From what I’m reading about @NikkiHaley and her new book my admiration for her has moved parabolically higher,” Fox News host Charles V Payne praised Haley, adding, “Rebuffing the overtures of the establishment isn’t easy, they have all the money and power. Haley is a rare heroic and unapologetic politician this country needs.”

Haley also is an outspoken defender of President Trump over the ongoing impeachment inquiry led by House Democrats. Halley has dismissed their actions to impeach the president after they claim he pressured Ukraine’s leader to investigate his political rival.

“The Ukrainians never did the investigation and the president released the funds. I mean, when you look at those, there’s just nothing impeachable there,” she said. “And more than that, I think the—the biggest thing that bothers me is the American people should decide this. Why do we have a bunch of people in Congress making this decision?”

“You’re going to impeach a president for asking for a favor that didn’t happen and—and giving money and it wasn’t withheld?” she added. “I don’t know what you would impeach him on. Impeachment is, like, the death penalty for a public official.”

Includes reporting from the Associated Press