WASHINGTON -- US President Donald Trump on Sunday confirmed that a US official team had arrived in the Democratic People's Republic of Korea (DPRK) to talk about the preparation for a summit between him and DPRK's top leader Kim Jong-un.

"Our United States team has arrived in North Korea to make arrangements for the Summit between Kim Jong Un and myself," he tweeted.

The Trump-Kim meeting is scheduled to be held in Singapore on June 12.

"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!" said the White House host.

The Washington Post reported earlier on Sunday that former US Ambassador to the Republic of Korea (ROK) Sung Kim on Sunday crossed into the DPRK to prepare for a summit with Choe Son-hui, DPRK's vice foreign minister.

The Washington Post quoted State Department spokesperson Heather Nauert as saying that the meetings are expected to continue Monday and Tuesday in the northern part of the demilitarized zone where DPRK leader Kim Jong-un met with ROK President Moon Jae-in on Saturday.