President Trump maintains business interests in various hotels around the world, including one in Washington, D. C. Various lobbyists and foreign dignitaries stay there when visiting Washington and
pay the expensive prices. Is this ethical? Why or Why not?

Yes, this is ethical.

Explanation:

President Donald J. Trump is a business man. He makes smart investments. Therefore leading to his 2.1 Billion Dollar net worth.

"quid pro quo" harassment takes place when a supervisor requires sex, sexual favors, or sexual contact from an employee/job candidate as a condition of their employment. only supervisors who have the authority to make tangible employment actions (i.e. hire, fire, promote, can commit "quid pro quo" harassment.