Ex-ethics chief: Trump's 'stable genius' tweet would cause boards to question CEOs' mental stability
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Former Office of Government Ethics Director Walter ShaubWalter Michael ShaubEx-White House ethics chief: Sarah Sanders tweet violates ethics laws Ex-ethics chief: Melania Trump's visit to migrant shelter a 'flim flam con job' State Dept's Facebook event on 'traveling with kids' wins scorn amid border crisis MORE ripped President TrumpDonald John TrumpTrump warns Iran's Rouhani: Threaten us 'and you will suffer' Pompeo: Iran's leaders resemble the mafia NYT's Haberman: Trump 'often tells the truth' MORE's tweet Saturday saying he was "very smart," claiming the tweet would be enough for corporate boards to hold an emergency meeting on a CEO's mental health.

"Forget the book. This might be enough to lead the board of any corporation to call an emergency meeting on its CEO’s mental status," Shaub wrote, quoting the president's tweet.

Shaub, who clashed with the president over his business interests, resigned from his government post last year.

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Trump fired off several tweets Saturday morning defending his mental fitness after the topic bubbled up this week following author Michael Wolff's new tell-all book, "Fire and Fury: Inside the Trump White House."

The book includes a claim that concerns about Trump's mental fitness are shared even among his top aides.

“My indelible impression of talking to them and observing them through much of the first year of his presidency, is that they all — 100 percent — came to believe he was incapable of functioning in his job,” Wolff wrote.

The White House has hit back against the claim, calling it "outrageous." 

"It's absolutely outrageous to make these types of accusations and it's simply untrue, and it’s sad that people are going and making these desperate attempts to attack the president,” White House press secretary Sarah Huckabee Sanders told "Fox & Friends" on Friday.