White House national security aide Sebastian Gorka warned North Korea not to challenge the United States' military capabilities because it won't end well for Pyongyang.

"Don't test America and don't test Donald J. Trump. We are not just a superpower. We were a superpower. We are now a hyperpower. Nobody in the world, especially not North Korea, comes close to challenging our military capabilities," Gorka told "Fox and Friends" Wednesday.

Trump tweeted earlier Wednesday that America's nuclear arsenal is "far stronger and more powerful than ever before."

He added: "Hopefully we will never have to use this power, but there will never be a time that we are not the most powerful nation in the world!"

On Tuesday, Trump threatened "fire and fury like the world has never seen" if North Korea attacked the U.S.

North Korea responded by warning it may strike Guam, a U.S. territory that serves as a U.S. military base.