Trump and Kim conclude historic summit with ceremonial signing

President Donald Trump and North Korean leader Kim Jong Un have signed what Trump says is a "very important'' and "pretty comprehensive'' document.

But Trump is refusing to tell reporters what the declaration says. The document is set to be handed out to reporters later.

Trump said Tuesday as the leaders wrapped up their historic summit in Singapore that he and Kim "have developed a very special bond'' during their day together.

Both leaders characterized the document they signed as historic. Trump said, "Both sides are going to be impressed with the result.''

Kim told reporters that "the world will see a major change,'' though it's unclear how.

After the signing, Trump was asked about a possible invitation to the White House for Kim. Trump said "absolutely, I would'' invite Kim.

The summit marked the first between a sitting U.S. president and a North Korean leader.