vetting on guns would have caught this guy. here's abc's chief white house correspondent jonathan karl, traveling with the president. >> reporter: traveling in asia, the president was asked whether, in light of the texas massacre, he would favor the kind of extreme vetting he wants for immigration for those who want to buy guns. the answer? a definitive no. >> if you did what you're suggesting, there would have been no difference three days ago. and you might not have had that very brave person who happened to have a gun or a rifle in his truck go out and shoot him and hit him and neutralize him. >> reporter: the president insisted tougher background checks could have made the texas church shooting worse. and on the north korea threat, a dramatic change in tone from the president. even expressing hope about talks with north korea, something he recently called a waste of time. >> i really believe that it