I don’t want to sound critical, God forbid.   Here is what Forbes opined about the letter Mr. Trump sent to the autocratic Turkish president last week (in relation to the slaughter and “ethnic cleansing” of the Kurds in northern Syria):

The letter’s tone, which some criticized as being unstatesmanlike for official diplomatic correspondence, led some to believe that it was satire published by The Onion, but the White House later confirmed that the letter is real, according to several media reports.

source

You can read the letter here, it’s short and to the point.