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North Korea’s new nuclear tests are not the biggest threat the country poses to the United States, Charles Krauthammer said Tuesday on Fox’s Special Report. “What’s really worrying — the doomsday scenario — is [if] they miniaturize the warhead, they put it on a missile. . . . If they can launch it from a submarine, that means they become invulnerable,” he explained.

A North Korean missile mounted on a submarine “would pose a perpetual threat” to the U.S. because it could not be located. Furthermore, “right now [North Korea] needs a long-range missile to hit a city in the U.S.,” but a submarine would obviate the need for a long-range missile.

Democrats’ opposition to missile defense “all through the ’80s and ’90s, after Reagan had proposed it, is the reason we are way behind where we ought to be,” Krauthammer said. “Yes, we have to build up our nuclear missile defenses, but we are way behind and we have to do it, especially if they go to submarines.”

Krauthammer believes history will remember the Obama administration for facilitating nuclear “proliferation in an age when we cannot afford it. . . . The Iranians could be undeterrable and Obama has been the facilitator. They will go nuclear within a decade; there is nothing in the agreement that will stop that. And the North Koreans — every administration since the ’90s has not succeeded in stopping them. But at least we ought to be developing our defenses.”