Washington: US President Donald Trump says his team has arrived in North Korea to arrange for his possible meeting with leader Kim Jong-un.

In a message on Twitter on Sunday, Trump said: "Our United States team has arrived in North Korea to make arrangements for the Summit between Kim Jong Un and myself. I truly believe North Korea has brilliant potential and will be a great economic and financial Nation one day. Kim Jong Un agrees with me on this. It will happen!"

Both Pyongyang and Washington are pressing ahead with plans for a meeting between the two leaders after Trump pulled out of the scheduled June 12 summit on Thursday, only to reconsider the decision the next day.

The Washington Post, citing a person familiar with the arrangements, said Sung Kim, a former US ambassador to South Korea and former nuclear negotiator with the North, was leading the preparations on the US side.

He crossed into North Korean territory with Allison Hooker, the Korea expert on the White House National Security Council. They met with Choe Son Hui, the North Korean vice foreign minister, the Post reported. Pentagon official Randall Schriver is also in Seoul currently, the Post said.