The United States needs to sharpen its biodefense strategy to guard against the possibility of a global pandemic and the potential of a terrorist attack using a virus, Joe Lieberman, a former longtime U.S. senator, told CNBC on Thursday.

“Two things keep me up. One is that a group like ISIS will develop a synthetic form of the flu, a powerful flu, and move it into our population,” said the 2000 Democratic vice presidential candidate. “The second, which is probably the more likely, [with] similar effect, is that there be an infectious disease pandemic.” Continue reading.