Since he refuses to release his tax returns its hard to pin him down on his debts, but if you google it, research has shown that he has massive loans with places like China and big banks like Goldman Sachs to finance his real estate ventures. It may not be personal debts but since he has these financial relationships with these places he may be influenced by them to make policies that favor big banks or trade deals favoring china in order to reduce his debts. Similarly he wants to cut taxes for the top 1% meaning himself. The presidency is all very convenient for Trumps financial bottom line. He would financially benefit greatly.