'Hardball' Guest Rules Climate Change Is Our Biggest National Security Threat

See more in the cross-post on the NewsBusters blog.

Late on Tuesday’s edition of MSNBC’s Hardball, panelist and Brookings Institution fellow Susan Hennessey offered a jaw-dropping assessment that “the single biggest national security threat is climate change” as it’s been the reason behind many of the recent global tensions.

Host Chris Matthews asked his panel of national security experts to tell him something they didn’t know about what keeps them up at night and when he arrived Hennessey, she uncorked an answer that would surly make Bernie Sanders proud.