President Trump has invited North Korean leader Kim Jong-un – on Twitter – to meet him at the fortified frontier that divides North and South Korea.
Mr Trump’s unexpected tweet suggested “saying hello” to Mr Kim during the US leader’s visit to South Korea.
North Korea has described it as a “very interesting suggestion”.
Mr Trump is due in South Korea to discuss the flagging North Korea denuclearisation talks. He flies there from the G20 summit in Japan.
In an apparently spontaneous gesture, Mr Trump mooted a meeting with Mr Kim.
Speaking at the G20 summit in Osaka, Mr Trump gave a few more details, telling reporters he decided on Saturday morning to “put out a feeler” to Mr Kim.
“If he’s there, we’ll see each other for two minutes and that’s fine,” he said in comments to reporters. He was speaking at the start of a working breakfast with Saudi Arabia’s Crown Prince Mohammad Bin Salman.
He made the comments ahead of key talks with Chinese President Xi Jinping over a tit-for-tat trade war seen as a drag on global growth.
It remains unclear whether officials with Mr Trump were briefed in advance about his overture to the North Korean leader.