Trump walking down the ramp. Observation: Trump's left leg takes the step and the right

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4. Every odd physical quirk he exhibits...

can be found on a list of symptoms for ALS (Lou Gehrig's Disease). Progressively worsening symptoms.

https://www.ninds.nih.gov/Disorders/Patient-Caregiver-Education/Fact-Sheets/Amyotrophic-lateral-Sclerosis-ALS-Fact-Sheet]

What are the symptoms?

The onset of ALS can be so subtle that the symptoms are overlooked but gradually these symptoms develop into more obvious weakness or atrophy that may cause a physician to suspect ALS. Some of the early symptoms include:

fasciculations (muscle twitches) in the arm, leg, shoulder, or tongue
muscle cramps
tight and stiff muscles (spasticity)
muscle weakness affecting an arm, a leg, neck or diaphragm.
slurred and nasal speech
difficulty chewing or swallowing.

For many individuals the first sign of ALS may appear in the hand or arm as they experience difficulty with simple tasks such as buttoning a shirt, writing, or turning a key in a lock. In other cases, symptoms initially affect one of the legs, and people experience awkwardness when walking or running or they notice that they are tripping or stumbling more often.

When symptoms begin in the arms or legs, it is referred to as “limb onset” ALS. Other individuals first notice speech or swallowing problems, termed “bulbar onset” ALS.

Regardless of where the symptoms first appear, muscle weakness and atrophy spread to other parts of the body as the disease progresses. Individuals may develop problems with moving, swallowing (dysphagia), speaking or forming words (dysarthria), and breathing (dyspnea).

Although the sequence of emerging symptoms and the rate of disease progression vary from person to person, eventually individuals will not be able to stand or walk, get in or out of bed on their own, or use their hands and arms.