This would be the equivalent letter by his "accountant".
Accountant X, member of Y accountant company (i.e. visits there on occasion)
Mr Trump's wealth is in excellent state. His cash flow is excellent, but he is on an overdraft of nnnn million.
His accounts are all on the brightest red.
No other president has been wealthier than him.
Signed:
not anymore and not for many years a fellow of the American College of Accountants
BTW: www.nbcnews.com/news/us-news/trump-doctor-wrote-health-letter-just-5-minutes-limo-waited-n638526
""If elected, Mr. Trump, I can state unequivocally, will be the healthiest individual ever elected to the presidency," Bornstein (the doctor) wrote.
Asked how he could justify the hyperbole, Bornstein said, "I like that sentence to be quite honest with you and all the rest of them are either sick or dead."

That old disease is a killer: death.