(WASHINGTON) — President Donald Trump and his top national security aides delivered contrasting messages of alarm and reassurance over North Korea’s expanding nuclear capabilities, with the commander in chief touting America’s atomic supremacy a day after threatening “fire and fury” for the communist country. As international alarm escalated over the still-remote possibility of nuclear confrontation, Trump on Wednesday dug in on his threats of military action and posted video of his ultimatum to North Korean leader Kim Jong Un.