SCOTUS has repeatedly hemmed in the scope of bribery charges and expanded executive privilege. The only way to nail the president for a corrupt appointment at this rate would be:

Enter LOBBYIST and POTUS on CONGRESS floor

LOBBYIST: projecting voice I am now rendering payment in exchange my appointment as ambassador to Sweden. What say you?

POTUS: projecting voice Yes, I knowingly accept these improper funds and -

CONGRESS immediately gathers a quorum, impeaches, and removes POTUS mid-sentence

POTUS: - name you ambassador to Sweden.