Frank von Hippel, a former Clinton administration official and the current co-director of Princeton University's Program on Science and Global Security discusses Japan's worsening nuclear disaster that continues to deepen just days after the devastating earthquake and a tsunami hit Japan’s northeast coast.

Von Hippel discussed the crisis in greater depth with Brian Williams Tuesday on NBC Nightly News --you can watch it below. Click here for more reporting on this issue, and click here for answers to frequently asked questions about the crisis.

Chat with nuclear physicist Frank von Hippel

Video: Nuclear physicist: 'This is a regional problem'

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