"I know that a letter is being delivered to me, a personal letter from Kim Jong-un to me…. It was handed at the border yesterday. I think it’s being brought in by Mike Pompeo," Trump told reporters aboard Air Force One on Friday, as quoted by the White House press pool.
Trump said he believes the letter is "positive" and called the method of communication "very elegant."
The US president said his relationship with Kim started on a bitter note and he, therefore, had to be rough on North Korea.
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Trump's comments came after a special envoy of South Korean president Moon Jae-in announced late Thursday that the third inter-Korean summit would be held on September 18-20 September in North Korea.