>> reporter: moving closer to language used by pyongyang, repeating the white house wants -- >> complete and verifiable and irreversible denuclearization of the korean peninsula. >> reporter: it could include the u.s. presence there. pompeo declined to say if it could affect the 25,000 u.s. troops in south korea. >> i'm not going to get into details of the discussions that we have had. we are prepared to take what will be security assurances that are different, unique, than america has been willing to provide previously. >> reporter: while only hours away fro historic summit, president trump is also dealing with fallout from his last one, refusing to let go of his feud with justin trudeau at the g7. dispatching his top aides to defend him in the fight over tariffs. >> he really stabbed us in the back. >> there's a special place in hell for any foreign leader that