The business mogul made the remark on Wednesday when he mocked his Democratic Party rival Hillary Clinton for her criticism of Trump's willingness to speak with Kim, calling the former secretary of state a "rank amateur", Politico reported.
"She's been doing it forever and she still doesn't get it," Trump told supporters at a rally in Atlanta.
"What the hell is wrong with speaking? And you know what? It's called opening a dialogue. It's opening a dialogue."
Trump, however, speculated that the meeting probably would never happen.
"But there's nothing -- I wouldn't go there," he said.