Since the beginning of President Donald Trump’s campaign, one popular topic among his Democratic critics has been his mental health. Does his sometimes erratic behavior preclude his fitness to lead? Is this behavior indicative of a larger health issue? Is Trump not “sane?”

Some might answer “yes” to these questions out of a genuine and justified dislike for the president and his policies. But this betrays those who are actually mentally ill for the purpose of “diagnosing” someone they don’t like, and is not just nonsensical — it’s dangerous.

We live in a world where “crazy” and “insane” are the words of choice to describe a wide range of entities, from political figures to awards show decisions and beyond. Our ingrained ableism seemingly allows us to use words associated with mental illness to express frustration or anger in a wide range of situations. But it also makes us think we can assume the position of a psychiatrist — Trump’s hypothetical psychiatrist, to be clear — from the comfort of our own homes.

It’s really easy to call someone mentally ill, and even easier if you’ve taken an abnormal psychology class and know the lingo to sound convincing. If you’re one of the 35 mental health professionals who co-signed a Feb. 13 letter to the New York Times expressing concern about Trump’s mental health, people might even believe you.

But still, none of those 35 individuals are Trump’s psychiatrist. None of them know him, have evaluated him or have likely interacted with him beyond watching him on television. Yet somehow these people diagnosed him from afar as “incapable of serving safely as president.” They say that mental health organizations have not spoken up about their purported concerns due to “a self-imposed dictum about evaluating public figures.”

Maybe these organizations have yet to speak up because they know that armchair diagnoses have no merit; that only someone’s personal doctor can make official mental health diagnoses. Maybe it’s because they are true “mental health professionals” who choose not to meddle in others’ affairs unless that person specifically comes to them as a patient.

Unfortunately, attitudes like the one expressed in this letter have made it to Congress, and some Democrats seem all too eager to expose Trump’s supposedly poor mental health. Sen. Al Franken of Minnesota proclaimed in a CNN interview that Republican colleagues have come to him concerned about Trump’s mental health. Rep. Ted Lieu of California was even considering introducing legislation that would mandate having a psychiatrist in the White House, arguing that “stigma” against mental illness prevents people from discussing Trump’s mental health.

Really, though, people like Lieu and Franken are actively perpetuating this stigma, not combating it. In being so vocal about their concerns, and with the knowledge that neither of these Congressmen are fans of Trump, it is difficult to see what purpose their words have. If Trump were mentally ill, would these men celebrate and then use the diagnosis against him? Considering that 1 in 5 adults deal with mental illness each year, it is statistically unlikely we’ve never had a mentally ill president before — would they be exceptions simply because they aren’t Trump?

Knowing whether Trump has a mental illness should not be anyone’s concern, much less the people who have the power to productively oppose him in Congress. Trump’s policies since taking office have perpetuated his image as a racist, sexist, transphobic, ableist individual in their own right, and unlike with mental illnesses, you don’t need to know any diagnostic criteria in order to identify and act upon those observations.