The US says its discussions with North Korea are moving “more quickly than expected” ahead of the summit in Singapore on Tuesday.
The preliminary talks between officials have been taking place ahead of the unprecedented first meeting.
The White House also confirms that President Donald Trump and Kim Jong-un will hold a one-on-one meeting, with only translators present.
The outcome may determine the fate of North Korea’s nuclear programme.
The US insists it will accept nothing less than complete denuclearisation of the Korean peninsula.
North Korea has said it is willing to commit to denuclearisation, but that term is open to interpretation.
It is also unclear what concessions Pyongyang could demand in return – which makes the summit very hard to predict, according to analysts.