Nikki Haley, former US ambassador to the UN, has said two top White House aides encouraged her to undermine President Donald Trump.
In a new book, Ms Haley says then-Chief of Staff John Kelly and then-Secretary of State Rex Tillerson told her to resist some of Mr Trump’s demands.
They reportedly told her they were “trying to save the country”.
There was no immediate comment from Mr Tillerson. Mr Kelly said he had wanted the president to be fully informed.
“If by ‘resistance’ and ‘stalling’ she means putting a staff process in place… to ensure [Mr Trump] knew all the pros and cons of what policy decision he might be contemplating so he could make an informed decision, then guilty as charged,” Mr Kelly told US broadcaster CBS.
Mr Trump tweeted his approval of the book, writing: “Good luck Nikki!”