National Security Adviser H.R. McMaster declined to say President Trump's rhetoric on North Korea represents a red line that would trigger a military conflict with the totalitarian country.

McMaster's comments on NBC's "Meet the Press" Sunday came days after President Trump said North Korea would experience "fire and fury like the world has never seen" if it continues to make threats against the U.S. North Korea later said it is making a plan to strike the waters near Guam, which has a major U.S. military presence, by the middle of this month.

Host Chuck Todd asked McMaster if Trump drew a red line because he said even a threat would get a military response.

"The president doesn't draw red lines," McMaster responded. "The president asks that he has viable solutions, which include diplomatic and military capabilities."

McMaster said Trump has engaged with world leaders, including China, to help persuade them North Korea is not just a threat to its southern neighbor and the United States, but also to the world.

Former Joint Chiefs of Staff Chairman Mike Mullen said later in the program that getting China involved is critical to a diplomatic resolution.

He added Trump's talk eliminates maneuvering space for him in any future talks because "it looks like brinksmanship to me."