Sir Kim announced on Wednesday that he was quitting, saying his position had become "impossible" following a furious tirade from the president denouncing him as a "pompous fool" and a "very stupid guy".
"I wish the British ambassador well. Some people just told me – too bad – they said he actually said some very good things about me," he said.
"I guess I quoted (Republican Senator) Lindsey Graham today. He said some things that were pretty nice from the British ambassador.
"I wish the British ambassador well but they have got to stop their leaking problems there just like they have to stop them in our country."