Experts argued in the book that Trump is “too mentally unstable” for office.

Dr Lee tells Daily Express US that, in late 2017, she received a warning from White House staff that Trump was showing signs of mental instability.

She said: “While I was meeting with Congress members, there was one Republican who was willing to meet with us and her office agreed to meet.

“We were discussing the situation with the Congress members, but the Congresswoman entered the office and then said she wasn’t willing to talk about it.

“Two people from the White House reached out to me in late 2017 with concerns about Trump. They were calling because of the book I edited.

“I unfortunately at the time had to refer them to the emergency room. At first, I wasn’t sure whether they were actually calling from the White House. Secondly, I didn’t want to become the President’s treater.

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“Once I do a personal examination or personally get involved, I can no longer educate the public.”

Dr Lee says she was concerned that getting directly involved would compromise her impartiality and therefore leave her unable to speak openly about her concerns regarding Trump’s mental health.

She continued: “The emergency room didn’t do anything. Later, when I called back the number they called from it was indeed the White House.

“When I called the emergency room, they said they were not concerned about the issue.

“It came out later that White House Chief of Staff at the time, John Kelly, bought my book and shared it with staff and may even have used it to prevent nuclear war with North Korea.”

Trump looks likely to win the Republican nomination after securing victories in the Iowa caucus and New Hampshire primary.

Haley says she will continue campaigning as the race heads to South Carolina.

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