I suspect Donald Trump will be President for the rest of his life. Hopefully, that isn't much longer. But he could last several more years. My spouse is a cardiologist, and also thinks what Sir Chumlee here has pointed out is likely true... CHF. He probably has to pee a lot and has a cath.
Edema from Congestive heart failure. The hands are from IV's. He's probably hooked up to diuretics frequently. His kidneys are no doubt fried. He's not long for this world. That's why he's parked behind the desk all the time now. Too many questions being asked in re cankles and hands.