Alternative medicine advocate Deepak Chopra took to Twitter Monday to voice his concerns about President Donald Trump’s mental health. Chopra appealed to Trump directly, asking the president to quell his fears by getting evaluated.

“I say this with trepidation. Is @POTUS brain impaired? If so what does this mean for the future of the world? What can we do? God bless,” he tweeted Monday.

He directed his second tweet on the subject straight to Trump.

“Dear @realDonaldTrump @POTUS Would you please submit to a psychiatric and neurological evaluation to restore our confidence. Thank you sir,” he wrote.

It’s not the first time Chopra, an endocrinologist by training, has voiced his disdain for the president. In an interview with Fox News in June 2016, Chopra called Trump “belligerent” and “emotionally retarded.”

“He is, unfortunately, and you know I would never say this unless I believe it to be 100 percent true, but he represents the racist, the bigot, the one who is prejudiced, the one who is full of fear and hatred, the one who represents the emotional retardation of a three-year-old,” Chopra said, adding that he was “fearful of what would happen to the U.S.” if Trump became president.

While the American Psychiatric Association has a policy that officially discourages speculation about the mental health of public figures, Chopra also isn’t alone in his discussion of the president’s mental state.

In the days following the election, a self-described “public manifesto” appeared online from the group Citizen Therapists Against Trumpism, made a case against the president and urged therapists to speak out against him.

In February, 35 psychiatrists, social workers and psychologists signed a letter to the New York Times in which they argued that Trump was not mentally fit to serve, arguing that his “speech and actions demonstrate an inability to tolerate views different from his own, leading to rage reactions.”

Harold Bornstein, Trump’s personal physician, has said Trump’s health is perfectly fine.

“There’s nothing seriously wrong with him,” he told health news outlet Stat in December. “He’s a few pounds overweight, which everybody can see, and that’s it. I’ve never been able to find anything wrong with him.”