Trump's mentioned letter to Erdogan: "Don't play tough"

Turkey's offensive against the Kurdish forces in northeastern Syria continues. The United States has already withdrawn its troops from the area, and then Turkey's offensive could begin.

Now a letter from Donald Trump to Erdogan has come out, urging the US president to re-evaluate his decision.

"You don't want to be responsible for the slaughter of thousands of people," Trump writes.

The letter has received a great deal of attention around the world, with many responding to the language used.