( CNN) Secretary of State Mike Pompeo has received a letter from Kim Jong Un to US President Donald Trump, according to a State Department official.

“A letter is being delivered to me, a personal letter from Kim Jong Un to me. That was handed at common borders, I don't know if you know that, but it was handed at the border yesterday, ” he told the press aboard Air force One, adding that he believes it will be a “positive” letter.

“It's being delivered. It's actually an elegant way. The style it used to be many years ago before we had all the new contraptions that we all use, ” Trump said. “But a letter is being delivered to me and I think it's going to be a positive letter.”