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President Obama criticized Donald Trump today during a press conference on nuclear security.

Obama was asked what he thought of the GOP frontrunner's recent statements about nuclear weapons, in which Trump said that Japan and South Korea would be better off if they armed themselves with nuclear weapons instead of having U.S. troops stationed there.

"They tell us that the person who made the statements doesn't know much about foreign policy or nuclear policy or the Korean peninsula or the world generally," Obama said.

He said that foreign leaders expressed concerns about the presidential election on the sidelines of the international nuclear summit.

"People pay attention to American elections," Obama said. "What we do is really important to the rest of the world."

The president said that even countries accustomed to a "carnival atmosphere" in their own politics want "sobriety and clarity" in U.S. elections because it impacts the entire world's prosperity and security.

He affirmed the U.S. alliance with Japan and South Korea, calling it one of "cornerstones of our presence in the Asian Pacific region."

"You don't mess with that ... It is an investment that rests on the sacrifices that our men and women made back in World War 2 when they were fighting throughout the Pacific.

"It is because of their sacrifices and the wisdom that American policymakers showed after World War 2 that we've been able to avoid catastrophe in those regions. And we don't want somebody in the Oval Office who doesn't recognize how important that is."

Watch the remarks above.

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