Via Mashable, Jimmy Kimmel talks about Trump calling Nancy Pelosi "a third-rate politician" and points out Trump's letter to Erdogan was not only crazy but ineffective:

Have you read Donald Trump's "leaked" letter to Turkish President Recep Tayyip Erdoğan yet? It's really quite something. The letter has inspired memes aplenty, and when it first came out people were so confused by its contents that they didn't even believe it was real.

It is, though. And in the clip above, Jimmy Kimmel mocks it line by line.

You could argue the letter itself is beyond parody, but Kimmel certainly gives the parody angle a go at the end — introducing an old (and very fake) "letter" from JFK to Kruschev at the time of the Cuban Missile Crisis.