McMaster: @POTUS to use Asia trip to urge "all responsible nations" to convince NKorea that nukes "a dead end" & past time to denuclearize.
"That's something that's under consideration," says McMaster, asked about US designating North Korea a state-sponsor of terrorism.
McMaster says it's not yet determined if Pres Trump will have a meeting with Pres Putin while at the APEC Summit in Vietnam.
