Singapore has become the most likely site for a landmark summit between U.S. President Donald Trump and North Korean leader Kim Jong Un in mid-June, reports have said, as the two nations move closer to formally announcing a date and location.

Trump is due to meet Kim to discuss the North's nuclear weapons program in the first-ever meeting of sitting leaders from the two countries, with the U.S. president saying Friday that the two sides had decided on a time and place.

"We now have a date and we have a location. We'll be announcing it soon," Trump said Friday without providing details.