" The German bank that has lent Trump millions of dollars has a $14 billion fine to the justice department. "

That's not a conflict of interest, it's just regular business.

If you are 'in business' - you 'do business' with banks. There are not that many big ones.

A loan is just a financial product like any other.

Taking a loan from a foreign bank is just part of doing business. Being president when a foreign bank owes a giant fine is just part of the job. Doing both of those at the same time is practically the definition of a conflict of interest.