Donald Trump Health Concerns Mount as Critics Accuse Him of Wearing a 'Contraption' or 'Diaper' Onstage: Watch

President Donald Trump's rear end once again has Americans asking: What's going on back there?

On September 10, during the second night of the Republican midterm convention — dubbed "Trump-a-palooza" for its heavy focus on the 80-year-old president — Trump was filmed greeting veterans as viewers noticed a blocky-looking protrusion beneath the back of his clothing.

The clip quickly generated confusion and questions surrounding the health of the octogenarian president.

"I once again ask what sort of contraption Trump is wearing around his a--," quipped journalist Aaron Rupar.

"What the [expletive] is he packing?" asked another X user.

"Trump appears to be wearing a diaper again," joked a third, referring to a salacious rumor that even President Barack Obama has referenced.

Trump has often been spotted with some sort of shape protruding from his loose-fitting suits. A common theory spreading online is that he is wearing an exoskeleton, which is a device used to help senior citizens and people with mobility issues walk.

Some pointed out that Trump is regularly filmed tapping his leg before he goes down stairs, which would fit with the exoskeleton theory.

Others theorize that Trump could be wearing a device from the brand Hypershell, which is popular among people with mobility issues.

The White House has never addressed the prominent and frequent bulge that protrudes from Trump's lower half. His doctors have continued to insist that he is in near perfect health, despite myriad visible physical maladies.

Such ailments include persistent bruising on his hands that he's at times attempted to cake over with makeup. For months, the White House's explanation of the bruising was that Trump "shook hands all day," but eventually the president contradicted that story by claiming he was taking an exorbitant amount of aspirin a day as a blood thinner, which can cause bruising as a side effect.

Trump also suffers from chronic venous insufficiency, which has made his ankles look enormous. His critics call them "cankles."

Furthermore, the president is known to rarely get a full night's sleep, though he regularly appears to supplement his sleep by dozing off during public appearances.

Despite Trump's numerous physical ailments, he has continued to insist he's the "healthiest president in recent history."

His latest official physical report from May, conducted by White House physician Sean Barbarella, went so far as to claim he has the heart of someone 14 years younger than he is. It also said he demonstrated "normal gait and balance."

It made no mention of Trump needing a supportive device to walk.