Worried about World War III, Trump says he wants an 'impenetrable' shield like Iron Dome to protect the US from hypersonic weapons. A missile defense expert says it's a long shot.

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U.S. President Donald Trump speaks to the media during a meeting with congressional leadership in the Roosevelt Room at the White House on November 28, 2017 in Washington, DC.
U.S. President Donald Trump speaks to the media during a meeting with congressional leadership in the Roosevelt Room at the White House on November 28, 2017 in Washington, DC.

Photo by Kevin Dietsch-Pool/Getty Images

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