Who will be there?

In addition to Mr. Trump and Mr. Kim, who both arrived in Singapore on Sunday each country will bring a delegation to the summit meeting, though the full list of who is taking part has not been released.

For the United States, Secretary of State Mike Pompeo and National Security Adviser John R. Bolton will be there, according to the White House.

Mr. Pompeo has taken the lead with North Korea in preparing for the meeting. Earlier this year, he twice visited Pyongyang, the North’s capital, to meet with Mr. Kim and help lay the groundwork.

He was also in the room when Mr. Trump met with a top North Korean official, Kim Yong-chol, at the White House earlier this month, and was alongside the president when he announced the summit meeting would, in fact, go ahead after being abruptly called off days earlier.

The meeting was nearly derailed after Mr. Bolton made comments suggesting North Korea should follow a “Libya model” for disarmament. Those comments drew ire from Mr. Kim, and Mr. Bolton was mentioned by name in the first of two strongly worded rebukes from the North Koreans that preceded Mr. Trump’s decision to walk away from it.

Since making those comments, Mr. Bolton has been taking a back seat in the negotiations, but the White House insists he is not being sidelined.