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.