North Korea's weapons program could be dismantled within a year.

That's according to White House national security adviser John Bolton... who told CBS's "Face the Nation" on Sunday that with Pyongyang's cooperation, the U.S. could move quickly. (SOUNDBITE) (English) JOHN BOLTON, WHITE HOUSE NATIONAL SECURITY ADVISER, SAYING: "Physically we would be able to dismantle the overwhelming bulk of their programs within a year." The goal a stark difference from estimates of experts.

Stanford University professor Siegfried Hecker visited the Yongbyon facility in 2010.

He predicted it would take around 10 years to dismantle a substantial part of that site alone.

Furthermore, U.S. intelligence agencies are unsure of the exact number of nuclear warheads North Korea has.

What's also unknown is whether North Korean leader Kim Jong Un will actually give up his nuclear arsenal.

He and President Donald Trump agreed at a summit last month to work toward denuclearization.

But on Saturday, The Washington Post reported that U.S. intelligence officials believe Pyongyang is looking for ways to hide its weapons.

Bolton refused to comment on the report, but said they're well aware of North Korea's record. (SOUNDBITE) (English) JOHN BOLTON, WHITE HOUSE NATIONAL SECURITY ADVISER, SAYING: "We know exactly what the risks are - them using negotiations to drag out the length of time they have to continue their nuclear, chemical, biological weapons programs and ballistic missiles." Bolton said Secretary of State Mike Pompeo is expected to discuss the U.S. plan to dismantle the weapons program with Pyongyang soon.