Transcript for Trump says he's been preparing for N Korea summit

From Canada the president heads to Singapore for the meeting with Kim Jong-un. He said he's flying with 16 boxes of material to read. Martha Raddatz has more from Seoul, South Korea. Reporter: Just yesterday president trump said he didn't need to prepare much for his sitdown with Kim Jong-un. It's about attitude, it's about willingness to get things done. Reporter: Today a different message. I always believe in preparation. But I've been preparing all my life. Reporter: The white house releasing pictures of the president huddling with secretary of state Mike Pompeo in the situation room and Kim Jong-un has been preparing, too. Singapore will be the farthest he's traveled as leader. He'll likely be surrounded by his squad of highly trained bodyguards hand picked, not only for loyalty but physical appearance. No blemishes allowed. Men reportedly separated from their families at an early age to dedicate themselves to the supreme leader. His drive to build a nuclear weapon capable of hitting the United States has been swift and shocking. But the biggest surprise, his skill on the world stage. Hand in hand with South Korea's president at the dmz. I think he wants to see something incredible happen. Reporter: Of course the biggest test is yet to come, when Kim Jong-un goes face to face with Donald Trump. March Martha Raddatz joining us from Seoul. What are you learning? All those details are so important. They're going down to the wire trying to figure it out. With these two unpredictable leaders you never know what's going to happen. You never do. Martha will join David when "World news tonight" airs from Singapore on Sunday.

This transcript has been automatically generated and may not be 100% accurate.