WH counsel can't help him.

Quotes:
The indictment or criminal prosecution of a sitting President would unconstitutionally undermine the  
capacity of the executive branch to perform its constitutionally assigned functions.
October 16, 2000

 In 1973, the Department of Justice concluded that the indictment and criminal prosecution of a sitting President would unduly interfere with the ability of the executive branch to perform its constitutionally assigned duties, and would thus violate the constitutional separation of powers. No court has addressed this question directly, but the judicial precedents that bear on the continuing validity of our constitutional analysis are consistent with both the analytic approach taken and the conclusions reached. Our view remains that a sitting President is constitutionally immune from indictment and criminal prosecution.

 
 https://www.justice.gov/sites/default/files/olc/opinions/2000/10/31/op-olc-v024-p0222.pdf

-- Modified on 5/22/2017 5:25:48 PM

After his 4 years,if he last that long. To see if he profited from his term as the POTUS. Using the office in a pay for play scheme and to look into new contracts entered and new developments.
He didn't enter into a blind trust so anything that he profited from being president technically belongs to the people of the United States, he's working for the us, he's an employee. This could be interesting....