Expect smiles and perhaps even a hug or two when President Trump finally meets Kim Jong Un in Singapore on Tuesday (9 p.m. U.S. Eastern time on Monday). Just don’t expect those protecting their respective leaders to share the happy emotions.

Because for the U.S. Secret Service and the North Korean Main Office of Adjutants and the Supreme Guard Command, this meeting brings a whole lot of stress, doubts, and possibilities for disaster.

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