It’s no secret that President Donald Trump has had quite the chaotic first few weeks of his presidency, which pretty much falls in line with how he behaved on the campaign trail. But a shocking new claim has been making the rounds that would certainly result in a new way of looking at his behavior: some experts are claiming Trump is showing classic signs of mental illness.

It’s a controversial statement to say the least, and many are slamming the claim as irresponsible and trivializing of actual mental illness. They add that people seem to be using a real illness to attack someone they politically disagree with. But other scientists aren’t so sure, saying that the signs may indeed be there. One California Democrat has even suggested putting forward legislation that would require the White House to staff a psychiatrist.

Experts have been writing letters making this claim to a number of publications. One letter was published by the Huffington Post claiming that Trump’s grandiosity and impulsivity suggests that he may have a mental illness, while another psychologist who wrote to U.S. News and World Report said Trump may have malignant narcissism. And a letter to the New York Times that was signed by several psychologists says that “the grave emotional instability indicated by Mr. Trump’s speech and actions makes him incapable of serving safely as president.”

“We are writing to express our grave concern regarding the mental stability of our President-Elect,” reads the letter submitted to then-President Obama by three psychologists and published in the Huffington Post. “Professional standards do not permit us to venture a diagnosis for a public figure whom we have not evaluated personally. Nevertheless, his widely reported symptoms of mental instability — including grandiosity, impulsivity, hypersensitivity to slights or criticism, and an apparent inability to distinguish between fantasy and reality — lead us to question his fitness for the immense responsibilities of the office. We strongly recommend that, in preparation for assuming these responsibilities, he receive a full medical and neuropsychiatric evaluation by an impartial team of investigators.”